### 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
invocation_context: ApiInvocationContext,
) -> ApiInvocationContext:
    
    values = (
        invocation_context.api_id,
        invocation_context.stage,
        invocation_context.path_with_query_string,
    )
    if all(values):
        return invocation_context
    
    if invocation_context.is_websocket_request():
        return invocation_context
    path = invocation_context.path
    headers = invocation_context.headers
    path_match = re.search(PATH_REGEX_USER_REQUEST, path)
    host_header = headers.get(HEADER_LOCALSTACK_EDGE_URL, "") or headers.get("Host") or ""
    host_match = re.search(HOST_REGEX_EXECUTE_API, host_header)
    test_invoke_match = re.search(PATH_REGEX_TEST_INVOKE_API, path)
    if path_match:
        api_id = path_match.group(1)
        stage = path_match.group(2)
        relative_path_w_query_params = "/%s" % path_match.group(3)
    elif host_match:
        api_id = extract_api_id_from_hostname_in_url(host_header)
        stage = path.strip("/").split("/")[0]