### Is there an existing issue for this?

- [X] I have searched the existing issues

### Feature description

SNS allows for the publishing of messages to an SMS destination with a phone number. Those messages are logged and stored in the `SnsStore`, but there is no way to retrieve them for verification. The request here is to expose a new endpoint which returns SMS messages from the store, similar to the one made available to retrieve email messages sent via SES.

### 🧑‍💻 Implementation

The `SNSServicePlatformEndpointMessagesApiResource` class makes endpoints available for accessing platform endpoint messages sent via SNS. A similar resource class could be implemented to provide new endpoints for accessing SMS messages.

Given that interaction platform endpoint messages is exposed at the path `/_aws/sns/platform-endpoint-messages`, SMS message interaction would presumably be exposed at `/_aws/sns/sms-messages`. A `GET` endpoint could accept an optional `phoneNumber` query parameter to filter messages based on the destination phone number.

```python
class SNSServiceSMSMessagesApiResource:
  @route(sns_constants.SMS_MSGS_ENDPOINT, methods=["GET"])
    def on_get(self, request: Request):
      account_id = #...
      region = #...
      filter_phone_number = request.args.get("phoneNumber")
      # get store; conditionally filter messages based on filter_phone_number
```

### Anything else?

_No response_
import itertools
import time
from dataclasses import dataclass, field
from typing import Dict, List, Literal, Optional, TypedDict, Union
from localstack.aws.api.sns import (
    MessageAttributeMap,
    PublishBatchRequestEntry,
    subscriptionARN,
    topicARN,
)
from localstack.services.stores import AccountRegionBundle, BaseStore, LocalAttribute
from localstack.utils.objects import singleton_factory
from localstack.utils.strings import long_uid
SnsProtocols = Literal[
    "http", "https", "email", "email-json", "sms", "sqs", "application", "lambda", "firehose"
]
SnsApplicationPlatforms = Literal[
    "APNS", "APNS_SANDBOX", "ADM", "FCM", "Baidu", "GCM", "MPNS", "WNS"
]
SnsMessageProtocols = Literal[SnsProtocols, SnsApplicationPlatforms]
@singleton_factory
def global_sns_message_sequence():