### 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
"""Provides a REST API for retrospective access to platform endpoint messages sent via SNS.
    This is registered as a LocalStack internal HTTP resource.
    This endpoint accepts:
    - GET param `accountId`: selector for AWS account. If not specified, return fallback `000000000000` test ID
    - GET param `region`: selector for AWS `region`. If not specified, return default "us-east-1"
    - GET param `endpointArn`: filter for `endpointArn` resource in SNS
    - DELETE param `accountId`: selector for AWS account
    - DELETE param `region`: will delete saved messages for `region`
    - DELETE param `endpointArn`: will delete saved messages for `endpointArn`
    """
    @route(sns_constants.PLATFORM_ENDPOINT_MSGS_ENDPOINT, methods=["GET"])
    def on_get(self, request: Request):