NodeJS Loader class is not implemented on ML example

[JSMonk]

🐛 Bug Report

I've tried to run the example with core 0.4.3 version and got the error with stack trace.

Expected Behavior

Run node.js without an error

Current Behavior

Throw the error like NodeJS Loader Error: NodeJS Loader class is not implemented

Possible Solution

Seems like it's related to the new API feature presented after HolyJS conference

Steps to Reproduce

1. clone https://github.com/metacall/ml-news-article-scraper-example repo
2. install all of the python and nodejs dependencies
3. run metacall app.js

Context (Environment)

macOS Docker

[viferga]

This has been mitigated but the proper solution would be to implement class support in NodeJS.

[viferga]

This should be solved once this PR is merged: #343