CloudFormation service cast most types into strings

It is probably a known limitation, but I could not find another public issue to track this.

Whenever you develop a resource provider you define a detailed JSON schema, but that schema is not being fully used by the CloudFormation service. For instance, if one is defined like this (full version [here](https://github.com/eduardomourar/aws-resource-provider-passwordpolicy)):

```json
{
"typeName": "OC::Organizations::PasswordPolicy",
"properties": {
"MinimumPasswordLength": {
"type": "integer"
},
"RequireLowercaseCharacters": {
"type": "boolean"
},
...
},
...
}
```

If I try to create that resource in AWS using the following template:

```yaml
AWSTemplateFormatVersion: '2010-09-09'

Resources:
PasswordPolicy:
Type: OC::Organizations::PasswordPolicy
Properties:
MinimumPasswordLength: 8
RequireLowercaseCharacters: True
```

I would expect to receive the input JSON below:

```json
{
"requestData": {
"resourceProperties": {
"MinimumPasswordLength": 8,
"RequireLowercaseCharacters": true,
...
},
...
},
...
}
```

Instead CloudFormation sends this event data where every property is being cast to string:

```json
{
"awsAccountId": ,
"bearerToken": ,
"region": "eu-central-1",
"responseEndpoint": "https://cloudformation.eu-central-1.amazonaws.com",
"action": "CREATE",
"nextToken": null,
"resourceType": "OC::Organizations::PasswordPolicy",
"resourceTypeVersion": "00000029",
"requestData": {
"logicalResourceId": "PasswordPolicy",
"resourceProperties": {
"MinimumPasswordLength": "8",
"RequireLowercaseCharacters": "true",
"RequireNumbers": "true",
"RequireUppercaseCharacters": "false",
"AllowUsersToChangePassword": "true",
"RequireSymbols": "false"
},
"previousResourceProperties": null,
"callerCredentials": { },
"platformCredentials": { },
"providerCredentials": { },
"providerLogGroupName": "oc-organizations-passwordpolicy-logs",
"systemTags": {
"aws:cloudformation:stack-name": ,
"aws:cloudformation:stack-id": ,
"aws:cloudformation:logical-id": "PasswordPolicy"
},
"stackTags": null,
"previousStackTags": null
},
"stackId":
}
```

A behavior like this makes a lot harder to develop the resource provider as well as the language plugin itself.