### 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
result = []
    for region, details in LambdaRegion.regions().items():
        for m in details.event_source_mappings:
            if not func_name or (m["FunctionArn"] in [func_name, func_arn(func_name)]):
                if event_source_arn_matches(mapped=m.get("EventSourceArn"), searched=source_arn):
                    result.append(m)
    return result
def get_function_version(arn, version):
    region = LambdaRegion.get()
    func = region.lambdas.get(arn)
    return format_func_details(func, version=version, always_add_version=True)
def publish_new_function_version(arn):
    region = LambdaRegion.get()
    lambda_function = region.lambdas.get(arn)
    versions = lambda_function.versions
    max_version_number = lambda_function.max_version()
    next_version_number = max_version_number + 1
    latest_hash = versions.get(VERSION_LATEST).get("CodeSha256")
    max_version = versions.get(str(max_version_number))
    max_version_hash = max_version.get("CodeSha256") if max_version else ""
    if latest_hash != max_version_hash:
        versions[str(next_version_number)] = {
            "CodeSize": versions.get(VERSION_LATEST).get("CodeSize"),
            "CodeSha256": versions.get(VERSION_LATEST).get("CodeSha256"),
            "Function": versions.get(VERSION_LATEST).get("Function"),
            "RevisionId": str(uuid.uuid4()),
        }