### Is there an existing issue for this?

- [X] I have searched the existing issues

### Feature description

The use case I have in mind is to run Node 16.x Lambdas - the default container registry is `lambci/lambda` which is effectively abandoned. [Not even Node 14.x has been published](https://github.com/lambci/docker-lambda/pull/330). However, switching the registry over to [`amazon/aws-lambda-nodejs`](https://hub.docker.com/r/amazon/aws-lambda-nodejs) still fails to pull the container, since localstack is looking for the tag `nodejs16.x`. I'd like to be able to specify that if the runtime is `nodejs16.x` it just looks for tag `16`.

### 🧑‍💻 Implementation

_No response_

### Anything else?

_No response_
_ensure_node_agent_initialized()
    
    if not THUNDRA_NODE_AGENT_INITIALIZED:
        return None
    result = AdditionalInvocationOptions()
    
    result.env_updates[THUNDRA_APIKEY_ENV_VAR_NAME] = _get_apikey(context.environment)
    
    result.env_updates[THUNDRA_AGENT_LAMBDA_HANDLER_ENV_VAR_NAME] = context.handler
    result.updated_handler = "/opt/nodejs/node_modules/@thundra/core/dist/handler.wrapper"
    
    log_disabled = context.environment.get(THUNDRA_AGENT_LOG_DISABLE_ENV_VAR_NAME)
    if not log_disabled:
        result.env_updates[THUNDRA_AGENT_LOG_DISABLE_ENV_VAR_NAME] = "false"
    
    agent_path_mapping = (
        "-v %s/node_modules/:/opt/nodejs/node_modules/" % THUNDRA_NODE_AGENT_LOCAL_PATH_ON_HOST
    )
    if context.docker_flags:
        context.docker_flags = f"{context.docker_flags} {agent_path_mapping}"
    else:
        context.docker_flags = agent_path_mapping
    return result
def _ensure_python_agent_initialized():
    global THUNDRA_PYTHON_AGENT_INITIALIZED
    if not THUNDRA_PYTHON_AGENT_INITIALIZED:
        if _init_python_agent_configs() and _install_python_agent():
            THUNDRA_PYTHON_AGENT_INITIALIZED = True
def _get_latest_python_agent_version():