### 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
post_sys_modules_keys = set(sys.modules.keys())
                for key in post_sys_modules_keys:
                    if key not in pre_sys_modules_keys:
                        sys.modules.pop(key)
        except Exception as e:
            LOG.error("Unable to exec: %s %s", script, traceback.format_exc())
            raise e
        finally:
            if lambda_cwd or lambda_env:
                if lambda_cwd:
                    os.chdir(previous_cwd)
                    sys.path.pop(0)
                if lambda_env:
                    os.environ = previous_env
        return module_vars[handler_function]
    lock = EXEC_MUTEX if lambda_cwd or lambda_env else empty_context_manager()
    with lock:
        return _do_exec_lambda_code()
def get_handler_function_from_name(handler_name, runtime=None):
    runtime = runtime or LAMBDA_DEFAULT_RUNTIME
    if runtime.startswith(tuple(DOTNET_LAMBDA_RUNTIMES)):
        return handler_name.split(":")[-1]
    return handler_name.split(".")[-1]
def get_java_handler(zip_file_content, main_file, lambda_function=None):
    """Creates a Java handler from an uploaded ZIP or JAR.
    :type zip_file_content: bytes