Hi

I have issues creating sns subscriptions through Cloudformation. If I attempt to include a `AWS::SNS::Subscription` resource in a Cloudformation template and run `create-stack` then I get a 500 Internal Server error. The full template:

```
AWSTemplateFormatVersion: '2010-09-09'
Description: 'Test'
Resources:
  MySnsTopic:
    Type: AWS::SNS::Topic
    Properties:
      TopicName: MySnsTopic
  MySnsTopicSubscription:
    Type: AWS::SNS::Subscription
    Properties:
      Protocol: sqs
      TopicArn: !Ref MySnsTopic
      Endpoint: !GetAtt
        - MySqsQueue
        - QueueArn
  MySqsQueue:
    Type: AWS::SQS::Queue
    Properties:
      QueueName: MySqsQueue
```

If I replace the references with hard-coded arns like this:

```
TopicArn: arn:aws:sns:eu-west-2:123456789012:MySnsTopic
Endpoint: arn:aws:sqs:elasticmq:000000000000:MySqsQueue
```

Then I get no errors but I get a warning:

`No moto Cloudformation support for AWS::SNS::Subscription`.

I can get around this issue by creating the subscription when creating the topic but the issue there is that I cannot add any attributes and in my case I need `RawMessageDelivery` set to true. So my questions are:

1. Is there no support to create `AWS::SNS::Subscription` resources through Cloudformation or am I doing something wrong?
2. If support is not there can I request it as a new feature?
3. Any suggestions on how I can work around this? I know I could do this through a script at startup but would like to not have any additional script steps other than deploying the Cloudformation stack.

<!-- Love localstack? Please consider supporting our collective:
👉  https://opencollective.com/localstack/donate -->
'StreamViewType': stream_view_type
        }
    table = None
    try:
        table = dynamodb.create_table(TableName=table_name, KeySchema=key_schema,
            AttributeDefinitions=attr_defs, ProvisionedThroughput={
                'ReadCapacityUnits': 10, 'WriteCapacityUnits': 10
            },
            StreamSpecification=stream_spec
        )
    except Exception as e:
        if 'ResourceInUseException' in str(e):
            
            return connect_to_resource('dynamodb', env=env).Table(table_name)
    time.sleep(2)
    return table
def get_apigateway_integration(api_id, method, path, env=None):
    apigateway = connect_to_service(service_name='apigateway', client=True, env=env)
    resources = apigateway.get_resources(restApiId=api_id, limit=100)
    resource_id = None
    for r in resources['items']:
        if r['path'] == path:
            resource_id = r['id']
    if not resource_id:
        raise Exception('Unable to find apigateway integration for path "%s"' % path)
    integration = apigateway.get_integration(
        restApiId=api_id, resourceId=resource_id, httpMethod=method
    )
    return integration
def get_apigateway_resource_for_path(api_id, path, parent=None, resources=None):