### 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_
for condition in conditions:
            if self._evaluate_condition(value, condition, field_exists):
                return True
        return False
    def _evaluate_condition(self, value, condition, field_exists: bool):
        if not isinstance(condition, dict):
            return value == condition
        elif (must_exist := condition.get("exists")) is not None:
            
            
            return must_exist == field_exists
        elif value is None:
            
            return False
        elif anything_but := condition.get("anything-but"):
            return value not in anything_but
        elif prefix := (condition.get("prefix")):
            return value.startswith(prefix)
        elif numeric_condition := condition.get("numeric"):
            return self._evaluate_numeric_condition(numeric_condition, value)
        return False
    @staticmethod
    def _evaluate_numeric_condition(conditions, value):