### Is there an existing issue for this?

- [X] I have searched the existing issues

### Feature description

Basically we want to only run the lambda when an insert is occurring in DynamoDB.
I tested using Dynobase deleting a record and the lambda still triggered.

```
resource "aws_lambda_event_source_mapping" "event-log" {
	event_source_arn  = aws_dynamodb_table.event-log.stream_arn
	function_name     = module.main.lambda-arn
	starting_position = "LATEST"
	enabled = true # change to false when truncating the table in localstack
	maximum_retry_attempts = 1 # limit retry on failure to 1 for now

	# https://dev.to/aws-builders/filtering-dynamodb-streams-before-lambda-p5p
	filter_criteria { # Doesn't seem to work on LocalStack for now
		filter {
			pattern = jsonencode({
				body = {
					eventName : ["INSERT"]
				}
			})
		}
	}
}
```


### 🧑‍💻 Implementation

_No response_

### Anything else?

 https://dev.to/aws-builders/filtering-dynamodb-streams-before-lambda-p5p
subscriptions = []
    def _factory(topic_arn: str, queue_url: str) -> Dict[str, str]:
        queue_arn = sqs_client.get_queue_attributes(
            QueueUrl=queue_url, AttributeNames=["QueueArn"]
        )["Attributes"]["QueueArn"]
        
        subscription = sns_client.subscribe(
            TopicArn=topic_arn,
            Protocol="sqs",
            Endpoint=queue_arn,
        )
        subscription_arn = subscription["SubscriptionArn"]
        
        sns_allow_topic_sqs_queue(
            sqs_queue_url=queue_url, sqs_queue_arn=queue_arn, sns_topic_arn=topic_arn
        )
        subscriptions.append(subscription_arn)
        return sns_client.get_subscription_attributes(SubscriptionArn=subscription_arn)[
            "Attributes"
        ]
    yield _factory
    for arn in subscriptions:
        try:
            sns_client.unsubscribe(SubscriptionArn=arn)
        except Exception as e:
            LOG.error("error cleaning up subscription %s: %s", arn, e)
@pytest.fixture
def sns_create_http_endpoint(sns_client, sns_create_topic, sns_subscription):