SqlSecureConnection: Should support the property HideInstance

The HideInstance is not supported in any resource yet, suggest adding it to either SqlServerSecureConnection or a another more suitable resource.

HideInstance is a property in the DB instances network properties and found via SQL Server Configuration Manager, see sample code:

##  apply surface area configuration control 2.12
$WmiObject = @{
    ComputerName = $SQLServer.NetName
    Namespace    = "root\Microsoft\SqlServer\ComputerManagement$($SQLServer.VersionMajor)"
    Class        = "ServerSettingsGeneralFlag"
    Filter       = "FlagName = 'HideInstance'"
}
$HideInstance = Get-WmiObject @WmiObject

if ($HideInstance.FlagValue -eq $false) {
    Write-Verbose "Setting HideInstance to True."
    $HideInstance.SetValue($true) | Out-Null
    Write-Verbose "HideInstance set to True"
}

##  apply surface area configuration control 8.2
$WmiObject = @{
    ComputerName = $SQLServer.NetName
    Namespace    = "root\Microsoft\SqlServer\ComputerManagement$($SQLServer.VersionMajor)"
    Class        = "ServerSettingsGeneralFlag"
    Filter       = "FlagName = 'ForceEncryption'"
}
$ForceEncryption = Get-WmiObject @WmiObject

if ($ForceEncryption.FlagValue -eq $false) {
    Write-Verbose "Setting ForceEncryption to True."
    $ForceEncryption.SetValue($true) | Out-Null
    Write-Verbose "ForceEncryption set to True"
}

Note $SQLServer is the SMO object

However this would only be half a solution as some client may wish to apply the certificate with this option.

Originally posted by @SQLHorizons in https://github.com/dsccommunity/SqlServerDsc/issues/1161#issuecomment-423769834

Start by reviewing the SqlServerSecureConnection resource and the other resources that configure SQL Server network properties. Use the supplied ServerSettingsGeneralFlag example for HideInstance and compare it with existing ForceEncryption handling. Done means HideInstance is supported in a suitable resource, with the certificate interaction addressed or clearly scoped.