### 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
"""Get details for a single function
    ---
    operationId: 'getFunction'
    parameters:
        - name: 'request'
          in: body
        - name: 'function'
          in: path
    """
    region = LambdaRegion.get()
    funcs = do_list_functions()
    arn_regex = r".*%s($|:.+)" % function
    is_arn = ":" in function
    for func in funcs:
        if function == func["FunctionName"] or (
            is_arn and re.match(arn_regex, func["FunctionArn"])
        ):
            return lookup_function(func, region, request.url)
    return not_found_error(func_arn(function))
@app.route("%s/functions/" % API_PATH_ROOT, methods=["GET"])
def list_functions():