Get-AzIntegrationAccountMap returns only maps in XSLT format

### Description

`Get-AzIntegrationAccountMap` only supports XSLT format and does not provide a way to work with other formats. Maps in Liquid format, for example, can be added via the portal or the REST API but are inaccessible via Azure PowerShell.

When listing maps, the list is filtered on the following line to show only XSLT:

https://github.com/Azure/azure-powershell/blob/b61106c491fc624776f3be3f933879c8cf7ffb36/src/ResourceManager/LogicApp/Commands.LogicApp/Utilities/IntegrationAccountMapOperations.cs#L105

The `-MapName` parameter can be used to retrieve a specific map, but retrieving a Liquid format map results in an "Unable to deserialize the response" error.

I would understand the limitation if the content of the map was included in the response and needed to be deserialized into a PowerShell object, but the response actually just includes a `contentLink` object with a URI inside to get the map content. The only significant difference in the API response compared to an XSLT map is the `mapType` property.

### Script/Steps for Reproduction

First, create an integration account in the Azure Portal and add a map in Liquid format. (This is unsupported in Azure PowerShell). Optionally, add another map in XSLT format to illustrate that the list of maps is filtered to XSLT.

Run `Get-AzIntegrationAccountMap` without specifying `-MapName`. Only XSLT maps are returned.
```powershell
Get-AzIntegrationAccountMap `
-ResourceGroupName MyIA-rg `
-Name MyIA
```

Run `Get-AzIntegrationAccountMap` with a `-MapName` specified to specifically request the Liquid map. The cmdlet will return "Unable to deserialize the response."

```powershell
Get-AzIntegrationAccountMap `
-ResourceGroupName MyIA-rg `
-Name MyIA `
-MapName MyLiquidMap
```

### Module Version

```powershell
Get-Module -ListAvailable

ModuleType Version Name PSEdition ExportedCommands
---------- ------- ---- --------- ----------------
Script 0.4.0 Az.Aks Core,Desk {Get-AzAks, New-AzAks, Remove-AzAks, Import-AzAksCredential...}
Script 0.4.0 Az.AnalysisServices Core,Desk {Resume-AzAnalysisServicesServer, Suspend-AzAnalysisServicesServer, Get-AzAnalysisServicesServer, Remove-AzAnalysisServicesServer...}
Script 0.4.0 Az.ApiManagement Core,Desk {Add-AzApiManagementRegion, Get-AzApiManagementSsoToken, New-AzApiManagementHostnameConfiguration, New-AzApiManagementCustomHostnameConfiguration...}
Script 0.4.0 Az.ApplicationInsights Core,Desk {Get-AzApplicationInsights, New-AzApplicationInsights, Remove-AzApplicationInsights, Set-AzApplicationInsightsPricingPlan...}
Script 0.4.0 Az.Automation Core,Desk {Get-AzAutomationHybridWorkerGroup, Get-AzAutomationJobOutputRecord, Import-AzAutomationDscNodeConfiguration, Export-AzAutomationDscConfiguration...}
Script 0.4.0 Az.Batch Core,Desk {Remove-AzBatchAccount, Get-AzBatchAccount, Get-AzBatchAccountKeys, New-AzBatchAccount...}
Script 0.4.0 Az.Billing Core,Desk {Get-AzBillingInvoice, Get-AzBillingPeriod, Get-AzEnrollmentAccount}
Script 0.4.0 Az.Cdn Core,Desk {Get-AzCdnProfile, Get-AzCdnProfileSsoUrl, New-AzCdnProfile, Remove-AzCdnProfile...}
Script 0.4.0 Az.CognitiveServices Core,Desk {Get-AzCognitiveServicesAccount, Get-AzCognitiveServicesAccountKey, Get-AzCognitiveServicesAccountSkus, Get-AzCognitiveServicesAccountUsage...}
Script 0.4.0 Az.Compute Core,Desk {Remove-AzAvailabilitySet, Get-AzAvailabilitySet, New-AzAvailabilitySet, Update-AzAvailabilitySet...}
Script 0.4.0 Az.Consumption Core,Desk {Get-AzConsumptionBudget, Get-AzConsumptionMarketplace, Get-AzConsumptionPriceSheet, Get-AzConsumptionReservationDetail...}
Script 0.4.0 Az.ContainerInstance Core,Desk {New-AzContainerGroup, Get-AzContainerGroup, Remove-AzContainerGroup, Get-AzContainerInstanceLog}
Script 0.4.0 Az.ContainerRegistry Core,Desk {New-AzContainerRegistry, Get-AzContainerRegistry, Update-AzContainerRegistry, Remove-AzContainerRegistry...}
Script 0.4.0 Az.DataLakeAnalytics Core,Desk {Get-AzDataLakeAnalyticsDataSource, New-AzDataLakeAnalyticsCatalogCredential, Remove-AzDataLakeAnalyticsCatalogCredential, Remove-AzDataLakeAnalyticsCatalogSecret...}
Script 0.4.0 Az.DataLakeStore Core,Desk {Get-AzDataLakeStoreTrustedIdProvider, Remove-AzDataLakeStoreTrustedIdProvider, Remove-AzDataLakeStoreFirewallRule, Set-AzDataLakeStoreTrustedIdProvider...}
Script 0.4.0 Az.DevTestLabs Core,Desk {Get-AzDtlAllowedVMSizesPolicy, Get-AzDtlAutoShutdownPolicy, Get-AzDtlAutoStartPolicy, Get-AzDtlVMsPerLabPolicy...}
Script 0.4.0 Az.Dns Core,Desk {Get-AzDnsRecordSet, New-AzDnsRecordConfig, Remove-AzDnsRecordSet, Set-AzDnsRecordSet...}
Script 0.4.0 Az.EventGrid Core,Desk {New-AzEventGridTopic, Get-AzEventGridTopic, Set-AzEventGridTopic, New-AzEventGridTopicKey...}
Script 0.4.0 Az.EventHub Core,Desk {New-AzEventHubNamespace, Get-AzEventHubNamespace, Set-AzEventHubNamespace, Remove-AzEventHubNamespace...}
Script 0.4.0 Az.Insights Core,Desk {Get-AzMetricDefinition, Get-AzMetric, Remove-AzLogProfile, Get-AzLogProfile...}
Script 0.4.0 Az.IotHub Core,Desk {Add-AzIotHubKey, Get-AzIotHubEventHubConsumerGroup, Get-AzIotHubConnectionString, Get-AzIotHubJob...}
Script 0.4.0 Az.KeyVault Core,Desk {Add-AzKeyVaultCertificate, Update-AzKeyVaultCertificate, Stop-AzKeyVaultCertificateOperation, Get-AzKeyVaultCertificateOperation...}
Script 0.4.0 Az.LogicApp Core,Desk {Get-AzIntegrationAccountAgreement, Get-AzIntegrationAccountCallbackUrl, Get-AzIntegrationAccountCertificate, Get-AzIntegrationAccount...}
Script 0.4.0 Az.MachineLearning Core,Desk {Move-AzMlCommitmentAssociation, Get-AzMlCommitmentAssociation, Get-AzMlCommitmentPlanUsageHistory, Remove-AzMlCommitmentPlan...}
Script 0.4.0 Az.MachineLearningCompute Core,Desk {Get-AzMlOpCluster, Get-AzMlOpClusterKey, Test-AzMlOpClusterSystemServicesUpdateAvailability, Update-AzMlOpClusterSystemService...}
Script 0.4.0 Az.MarketplaceOrdering Core,Desk {Get-AzMarketplaceTerms, Set-AzMarketplaceTerms}
Script 0.4.0 Az.Media Core,Desk {Sync-AzMediaServiceStorageKeys, Set-AzMediaServiceKey, Get-AzMediaServiceKeys, Get-AzMediaServiceNameAvailability...}
Script 0.4.0 Az.Network Core,Desk {Add-AzApplicationGatewayAuthenticationCertificate, Get-AzApplicationGatewayAuthenticationCertificate, New-AzApplicationGatewayAuthenticationCertificate, Remove-AzApplicationGateway... Script 0.4.0 Az.NotificationHubs Core,Desk {Get-AzNotificationHub, Get-AzNotificationHubAuthorizationRules, Get-AzNotificationHubListKeys, Get-AzNotificationHubPNSCredentials...}
Script 0.4.0 Az.OperationalInsights Core,Desk {New-AzOperationalInsightsAzureActivityLogDataSource, New-AzOperationalInsightsCustomLogDataSource, Disable-AzOperationalInsightsLinuxCustomLogCollection, Disable-AzOperationalInsig... Script 0.4.0 Az.PolicyInsights Core,Desk {Get-AzPolicyEvent, Get-AzPolicyState, Get-AzPolicyStateSummary}
Script 0.4.0 Az.PowerBIEmbedded Core,Desk {Remove-AzPowerBIWorkspaceCollection, Get-AzPowerBIWorkspaceCollection, Get-AzPowerBIWorkspaceCollectionAccessKeys, Get-AzPowerBIWorkspace...}
Script 0.4.0 Az.Profile Core,Desk {Disable-AzDataCollection, Disable-AzContextAutosave, Enable-AzDataCollection, Enable-AzContextAutosave...}
Script 0.4.0 Az.RecoveryServices Core,Desk {Get-AzRecoveryServicesBackupProperty, Get-AzRecoveryServicesVault, Get-AzRecoveryServicesVaultSettingsFile, New-AzRecoveryServicesVault...}
Script 0.4.0 Az.RedisCache Core,Desk {Remove-AzRedisCachePatchSchedule, New-AzRedisCacheScheduleEntry, Get-AzRedisCachePatchSchedule, New-AzRedisCachePatchSchedule...}
Script 0.4.0 Az.Relay Core,Desk {New-AzRelayNamespace, Get-AzRelayNamespace, Set-AzRelayNamespace, Remove-AzRelayNamespace...}
Script 0.4.0 Az.Resources Core,Desk {Get-AzProviderOperation, Remove-AzRoleAssignment, Get-AzRoleAssignment, New-AzRoleAssignment...}
Script 0.4.0 Az.ServiceBus Core,Desk {New-AzServiceBusNamespace, Get-AzServiceBusNamespace, Set-AzServiceBusNamespace, Remove-AzServiceBusNamespace...}
Script 0.4.0 Az.ServiceFabric Core,Desk {Add-AzServiceFabricApplicationCertificate, Add-AzServiceFabricClientCertificate, Add-AzServiceFabricClusterCertificate, Add-AzServiceFabricNode...}
Script 0.4.0 Az.SignalR Core,Desk {New-AzSignalR, Get-AzSignalR, Get-AzSignalRKey, New-AzSignalRKey...}
Script 0.4.0 Az.Sql Core,Desk {Get-AzSqlDatabaseTransparentDataEncryption, Get-AzSqlDatabaseTransparentDataEncryptionActivity, Set-AzSqlDatabaseTransparentDataEncryption, Get-AzSqlDatabaseUpgradeHint...}
Script 0.4.0 Az.Storage Core,Desk {Get-AzStorageAccount, Get-AzStorageAccountKey, New-AzStorageAccount, New-AzStorageAccountKey...}
Script 0.4.0 Az.StreamAnalytics Core,Desk {Get-AzStreamAnalyticsFunction, Get-AzStreamAnalyticsDefaultFunctionDefinition, New-AzStreamAnalyticsFunction, Remove-AzStreamAnalyticsFunction...}
Script 0.4.0 Az.Tags Core,Desk {Remove-AzTag, Get-AzTag, New-AzTag}
Script 0.4.0 Az.TrafficManager Core,Desk {Add-AzTrafficManagerCustomHeaderToEndpoint, Remove-AzTrafficManagerCustomHeaderFromEndpoint, Add-AzTrafficManagerCustomHeaderToProfile, Remove-AzTrafficManagerCustomHeaderFromProfi... Script 0.4.0 Az.UsageAggregates Core,Desk Get-UsageAggregates
Script 0.4.0 Az.Websites Core,Desk {Get-AzAppServicePlan, Set-AzAppServicePlan, New-AzAppServicePlan, Remove-AzAppServicePlan...}
Script 5.3.0 Azure Desk {Get-AzureAutomationCertificate, Get-AzureAutomationConnection, New-AzureAutomationConnection, Remove-AzureAutomationConnection...}
Script 2.0.230 oh-my-posh Desk {Show-Colors, Show-ThemeColors, Show-ThemeSymbols, Get-Theme...}
Manifest 0.7.1 posh-docker Desk ConvertFrom-Docker
Binary 0.7.0 PSKubectl Desk {Compare-KubeResource, ConvertFrom-KubeYaml, Get-KubeConfig, Get-KubeDeployment...}
Binary 0.8.1 SHiPS Desk
Script 0.0.2 Trackyon.Utils Desk {Backup-Location, Get-OperatingSystem, New-Directory, Set-As...}
Manifest 4.0.12 VSTeam Desk {Add-VSTeamAzureRMServiceEndpoint, Add-VSTeamSonarQubeEndpoint, Add-VSTeamKubernetesEndpoint, Add-VSTeamServiceFabricEndpoint...}

Directory: C:\Program Files\PowerShell\Modules

ModuleType Version Name PSEdition ExportedCommands
---------- ------- ---- --------- ----------------
Script 0.7.1 posh-git Desk {Invoke-NullCoalescing, Add-PoshGitToProfile, Write-GitStatus, Write-Prompt...}

Directory: C:\program files\powershell\6\Modules

ModuleType Version Name PSEdition ExportedCommands
---------- ------- ---- --------- ----------------
Manifest 6.1.0.0 CimCmdlets Core {Get-CimAssociatedInstance, Get-CimClass, Get-CimInstance, Get-CimSession...}
Manifest 1.1.0.0 Microsoft.PowerShell.Archive Desk {Compress-Archive, Expand-Archive}
Manifest 6.1.0.0 Microsoft.PowerShell.Diagnostics Core {Get-WinEvent, New-WinEvent}
Manifest 6.1.0.0 Microsoft.PowerShell.Host Core {Start-Transcript, Stop-Transcript}
Manifest 6.1.0.0 Microsoft.PowerShell.Management Core {Add-Content, Clear-Content, Clear-ItemProperty, Join-Path...}
Manifest 6.1.0.0 Microsoft.PowerShell.Security Core {Get-Acl, Set-Acl, Get-PfxCertificate, Get-Credential...}
Manifest 6.1.0.0 Microsoft.PowerShell.Utility Core {Format-List, Format-Custom, Format-Table, Format-Wide...}
Manifest 6.1.0.0 Microsoft.WSMan.Management Core {Disable-WSManCredSSP, Enable-WSManCredSSP, Get-WSManCredSSP, Set-WSManQuickConfig...}
Script 1.1.7.2 PackageManagement Desk {Find-Package, Get-Package, Get-PackageProvider, Get-PackageSource...}
Script 1.6.7 PowerShellGet Desk {Find-Command, Find-DSCResource, Find-Module, Find-RoleCapability...}
Script 0.0 PSDesiredStateConfiguration Desk {Get-PublicKeyFromFile, GetModule, ImportClassResourcesFromModule, Test-NodeResourceSource...}
Script 6.1.0.0 PSDiagnostics Core {Disable-PSTrace, Disable-PSWSManCombinedTrace, Disable-WSManTrace, Enable-PSTrace...}
Script 2.0.0 PSReadLine Desk {Get-PSReadLineKeyHandler, Set-PSReadLineKeyHandler, Remove-PSReadLineKeyHandler, Get-PSReadLineOption...}
Binary 1.1.2 ThreadJob Desk Start-ThreadJob
```

### Environment Data

```powershell
$PSVersionTable

Name Value
---- -----
PSVersion 6.1.0
PSEdition Core
GitCommitId 6.1.0
OS Microsoft Windows 10.0.17134
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
```

### Debug Output

```
Get-AzIntegrationAccountMap `
>> -ResourceGroupName EDI-AzureDevOps-Demo `
>> -Name Demo-IA `
>> -MapName MyLiquidMap
DEBUG: 4:13:10 PM - GetAzureIntegrationAccountMapCommand begin processing with ParameterSet '__AllParameterSets'.
DEBUG: 4:13:10 PM - using account id 'redacted@redacted.com'...
DEBUG: [Common.Authentication]: Authenticating using Account: 'redacted@redacted.com', environment: 'AzureCloud', tenant: 'redacted'
DEBUG: ============================ HTTP REQUEST ============================

HTTP Method:
GET

Absolute Uri:
https://management.azure.com/subscriptions/redacted/resourceGroups/EDI-AzureDevOps-Demo/providers/Microsoft.Logic/integrationAccounts/Demo-IA/maps/MyLiquidMap?api-version=2016-06-01

Headers:
x-ms-client-request-id : 23b726bb-8e66-4d76-a4cc-a4edadf297c8
Accept-Language : en-US

Body:

DEBUG: ============================ HTTP RESPONSE ============================

Status Code:
OK

Headers:
Cache-Control : no-cache
Pragma : no-cache
Vary : Accept-Encoding
x-ms-request-id : northcentralus:f65f9ab8-7a5b-4b8a-8072-f00e62d0e917
Strict-Transport-Security : max-age=31536000; includeSubDomains
x-ms-ratelimit-remaining-subscription-reads: 11994
x-ms-correlation-request-id : 31149dae-f0af-4118-86e4-9b215079fb41
x-ms-routing-request-id : SOUTHCENTRALUS:20181106T211311Z:31149dae-f0af-4118-86e4-9b215079fb41
X-Content-Type-Options : nosniff
Date : Tue, 06 Nov 2018 21:13:11 GMT

Body:
{
"properties": {
"mapType": "Liquid",
"contentLink": {
"uri": "https://prod-18.northcentralus.logic.azure.com:443/integrationAccounts/redacted/maps/MyLiquidMap/contents/Value?api-version=2015-08-01-preview&se=2018-11-07T01%3A13%3A11.2753305Z&sp=%2Fmaps%2FMyLiquidMap%2Fread&sv=1.0&sig=jRSsBj_01o3HO9zzsIDfpyko_4gb1K-8z3IHAMfmmQA",
"contentVersion": "\"0x8D6442C77095807\"",
"contentSize": 1839,
"contentHash": {
"algorithm": "md5",
"value": "4k2spvkqQ1ln+3Z+tYEwdQ=="
}
},
"createdTime": "2018-11-06T21:11:48.5814543Z",
"changedTime": "2018-11-06T21:11:48.5822246Z",
"metadata": {
"fileName": null
}
},
"id": "/subscriptions/redacted/resourceGroups/EDI-AzureDevOps-Demo/providers/Microsoft.Logic/integrationAccounts/Demo-IA/maps/MyLiquidMap",
"name": "MyLiquidMap",
"type": "Microsoft.Logic/integrationAccounts/maps"
}

Get-AzIntegrationAccountMap : Unable to deserialize the response.
At line:1 char:1
+ Get-AzIntegrationAccountMap `
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : CloseError: (:) [Get-AzIntegrationAccountMap], SerializationException
+ FullyQualifiedErrorId : Microsoft.Azure.Commands.LogicApp.Cmdlets.GetAzureIntegrationAccountMapCommand

DEBUG: AzureQoSEvent: CommandName - Get-AzIntegrationAccountMap; IsSuccess - False; Duration - 00:00:00.6632264; Exception - Microsoft.Rest.SerializationException: Unable to deserialize the response. ---> Newtonsoft.Json.JsonSerializationException: Error converting value "Liquid" to type 'Microsoft.Azure.Management.Logic.Models.MapType'. Path 'properties.mapType', line 1, position 33. ---> System.ArgumentException: Requested value 'Liquid' was not found.
at Newtonsoft.Json.Utilities.EnumUtils.ParseEnum(Type enumType, String value, Boolean disallowNumber)
at Newtonsoft.Json.Converters.StringEnumConverter.ReadJson(JsonReader reader, Type objectType, Object existingValue, JsonSerializer serializer)
--- End of inner exception stack trace ---
at Newtonsoft.Json.Converters.StringEnumConverter.ReadJson(JsonReader reader, Type objectType, Object existingValue, JsonSerializer serializer)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.DeserializeConvertable(JsonConverter converter, JsonReader reader, Type objectType, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
at Newtonsoft.Json.Serialization.JsonSerializerProxy.DeserializeInternal(JsonReader reader, Type objectType)
at Newtonsoft.Json.Linq.JToken.ToObject(Type objectType, JsonSerializer jsonSerializer)
at Microsoft.Rest.Serialization.TransformationJsonConverter.ReadJson(JsonReader reader, Type objectType, Object existingValue, JsonSerializer serializer)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.DeserializeConvertable(JsonConverter converter, JsonReader reader, Type objectType, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
at Microsoft.Rest.Serialization.SafeJsonConvert.DeserializeObject[T](String json, JsonSerializerSettings settings)
at Microsoft.Azure.Management.Logic.MapsOperations.GetWithHttpMessagesAsync(String resourceGroupName, String integrationAccountName, String mapName, Dictionary`2 customHeaders, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at Microsoft.Azure.Management.Logic.MapsOperations.GetWithHttpMessagesAsync(String resourceGroupName, String integrationAccountName, String mapName, Dictionary`2 customHeaders, CancellationToken cancellationToken)
at Microsoft.Azure.Management.Logic.MapsOperationsExtensions.GetAsync(IMapsOperations operations, String resourceGroupName, String integrationAccountName, String mapName, CancellationToken cancellationToken)
at Microsoft.Azure.Management.Logic.MapsOperationsExtensions.Get(IMapsOperations operations, String resourceGroupName, String integrationAccountName, String mapName)
at Microsoft.Azure.Commands.LogicApp.Cmdlets.GetAzureIntegrationAccountMapCommand.ExecuteCmdlet()
at Microsoft.WindowsAzure.Commands.Utilities.Common.AzurePSCmdlet.ProcessRecord();
DEBUG: Finish sending metric.
DEBUG: 4:13:12 PM - GetAzureIntegrationAccountMapCommand end processing.
DEBUG: 4:13:12 PM - GetAzureIntegrationAccountMapCommand end processing.
```