### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When passed to SQS, keys of the messages attributes on SNS are renamed from StringValue to Value and DataType to Type.

### Expected Behavior

The keys should not be renamed

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

    docker run localstack/localstack

#### Flow
 - Create a SQS Queue
 - Create a SNS Topic
 - Configure a Subscription of the new Topic that sends to the SQS queue (specify a raw delivery at true)
 - Publish a message to SNS Topic with attribute { DataType: "string", StringValue: "anything"}
 - Attributes are no more StringValue but just value. 

(can't provide more, I have issues with my awslocal, I got this issue with the PHP client initially)

### Environment

```markdown
- OS: Docker Desktop for mac
- LocalStack: 1.4
```


### Anything else?

The AWS SNS official documentation : https://docs.aws.amazon.com/sns/latest/api/API_MessageAttributeValue.html


MR for fix is coming
)
        dlq_url = sqs_create_queue()
        dlq_arn = sqs_queue_arn(dlq_url)
        sns_allow_topic_sqs_queue(
            sqs_queue_url=dlq_url, sqs_queue_arn=dlq_arn, sns_topic_arn=topic_arn
        )
        aws_client.sns.set_subscription_attributes(
            SubscriptionArn=http_subscription_arn,
            AttributeName="RedrivePolicy",
            AttributeValue=json.dumps({"deadLetterTargetArn": dlq_arn}),
        )
        assert poll_condition(
            lambda: len(server.log) >= 1,
            timeout=5,
        )
        sub_request, _ = server.log[0]
        payload = sub_request.get_json(force=True)
        assert payload["Type"] == "SubscriptionConfirmation"
        assert sub_request.headers["x-amz-sns-message-type"] == "SubscriptionConfirmation"
        subscribe_url = payload["URL"]
        service_url, subscribe_url_path = payload["URL"].rsplit("/", maxsplit=1)
        confirm_subscribe_request = requests.get(subscribe_url)
        confirm_subscribe = xmltodict.parse(confirm_subscribe_request.content)
        assert (
            confirm_subscribe["ConfirmSubscriptionResponse"]["ConfirmSubscriptionResult"][
                "SubscriptionArn"
            ]
            == http_subscription_arn
        )
        subscription_attributes = aws_client.sns.get_subscription_attributes(