### 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
relative_path_w_query_params = "/%s" % path.lstrip("/").partition("/")[2]
    elif test_invoke_match:
        
        stage = None
        region_name = invocation_context.region_name
        api_id = test_invoke_match.group(1)
        resource_id = test_invoke_match.group(2)
        query_string = test_invoke_match.group(4) or ""
        apigateway = aws_stack.connect_to_service(
            service_name="apigateway", region_name=region_name
        )
        resource = apigateway.get_resource(restApiId=api_id, resourceId=resource_id)
        resource_path = resource.get("path")
        relative_path_w_query_params = f"{resource_path}{query_string}"
    else:
        raise Exception(
            f"Unable to extract API Gateway details from request: {path} {dict(headers)}"
        )
    if api_id:
        
        
        if getattr(THREAD_LOCAL, "request_context", None) is not None:
            api_region = get_api_region(api_id)
            THREAD_LOCAL.request_context.headers[MARKER_APIGW_REQUEST_REGION] = api_region
    
    invocation_context.api_id = api_id
    invocation_context.stage = stage
    invocation_context.path_with_query_string = relative_path_w_query_params
    return invocation_context
def get_api_region(api_id: str) -> Optional[str]: