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# Type of request: This is a ...

[*] bug report
[ ] feature request

# Detailed description

When setting up a FIFO SNS topic with a FIFO SQS subscriber, in the case where a `MessageGroupId` is sent to the SNS topic it fails when being sent to the SQS queue as the `MessageGroupId` isn't passed along.

## Expected behavior

`MessageGroupId` should be passed along to the SQS queue

## Actual behavior

It's not passed along and it will error with the message:

```An error occurred (MissingParameter) when calling the SendMessage operation: The request must contain the parameter MessageGroupId.```


I believe the error is around here:
https://github.com/localstack/localstack/blob/master/localstack/services/sns/sns_listener.py#L295

# Steps to reproduce

```
        aws sns create-topic --attributes=FifoTopic=true --name local_sns --endpoint-url=http://localstack:4566
        aws sqs create-queue --endpoint-url=http://localstack:4566 --queue-name local_queue
        aws --endpoint-url=http://localstack:4566 sns subscribe --topic-arn arn:aws:sns:eu-west-1:000000000000:local_sns --protocol sqs --notification-endpoint http://localstack:4566/000000000000/local_queue
```

Then sending a new message to the topic with a messagegroupid results in the error above.


## Command used to start LocalStack

Docker compose

## Client code (AWS SDK code snippet, or sequence of "awslocal" commands)

...

def api_name(self):
        return 'sns'
    def forward_request(self, method, path, data, headers):
        if method == 'OPTIONS':
            return 200
        
        try:
            aws_stack.check_valid_region(headers)
            aws_stack.set_default_region_in_headers(headers)
        except Exception as e:
            return make_error(message=str(e), code=400)
        if method == 'POST':
            
            req_data = urlparse.parse_qs(to_str(data), keep_blank_values=True)
            
            if not req_data:
                parsed_path = urlparse.urlparse(path)
                req_data = urlparse.parse_qs(parsed_path.query, keep_blank_values=True)
            req_action = req_data['Action'][0]
            topic_arn = req_data.get('TargetArn') or req_data.get('TopicArn') or req_data.get('ResourceArn')
            if topic_arn:
                topic_arn = topic_arn[0]
                topic_arn = aws_stack.fix_account_id_in_arns(topic_arn)
            if req_action == 'SetSubscriptionAttributes':
                sub = get_subscription_by_arn(req_data['SubscriptionArn'][0])
                if not sub:
                    return make_error(message='Unable to find subscription for given ARN', code=400)