### 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
from localstack.services import generic_proxy  
        
        LAMBDA_EXECUTOR.startup()
        
        validate_lambda_config()
        
        import localstack.contrib.thundra  
        generic_proxy.serve_flask_app(app=app, port=port)
    except Exception:
        LOG.exception("Error while starting up lambda service")
        raise
def on_config_change(config_key: str, config_newvalue: str) -> None:
    global LAMBDA_EXECUTOR
    if config_key != "LAMBDA_EXECUTOR":
        return
    LOG.debug(
        "Received config event for lambda executor - Key: '{}', Value: {}".format(
            config_key, config_newvalue
        )
    )
    LAMBDA_EXECUTOR.cleanup()
    LAMBDA_EXECUTOR = lambda_executors.AVAILABLE_EXECUTORS.get(
        get_executor_mode(), lambda_executors.DEFAULT_EXECUTOR
    )
    LAMBDA_EXECUTOR.startup()
def register_config_listener():
    from localstack.utils import config_listener
    config_listener.CONFIG_LISTENERS.append(on_config_change)
register_config_listener()