### 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_
},
            ],
        }
        role = create_role(RoleName=role_name, AssumeRolePolicyDocument=json.dumps(trust_policy))
        aws_client.iam.attach_role_policy(
            RoleName=role_name,
            PolicyArn="arn:aws:iam::aws:policy/AmazonKinesisFirehoseFullAccess",
        )
        aws_client.iam.attach_role_policy(
            RoleName=role_name, PolicyArn="arn:aws:iam::aws:policy/AmazonS3FullAccess"
        )
        subscription_role_arn = role["Role"]["Arn"]
        if is_aws_cloud():
            time.sleep(10)
        s3_create_bucket(Bucket=bucket_name)
        stream = firehose_create_delivery_stream(
            DeliveryStreamName=stream_name,
            DeliveryStreamType="DirectPut",
            S3DestinationConfiguration={
                "RoleARN": subscription_role_arn,
                "BucketARN": f"arn:aws:s3:::{bucket_name}",
                "BufferingHints": {"SizeInMBs": 1, "IntervalInSeconds": 60},
            },
        )
        topic = sns_create_topic(Name=topic_name)
        sns_subscription(
            TopicArn=topic["TopicArn"],
            Protocol="firehose",
            Endpoint=stream["DeliveryStreamARN"],
            Attributes={"SubscriptionRoleArn": subscription_role_arn},