refactor(ci): macOS support and more fixes

[Yohe-Am]

Describe your change

This tackles a bunch of minor tasks including:

• MacOs CI tests
• Migrate to using # ghjk-hook markers in user shell configs
• Make installation configurable through env vars
• Fixing minor bugs
• Rewrite action in js

Motivation and context

Improvements determined through #495 on metatype.

Migration notes

Lines that load the ghjk hooks will need to be removed from shell configs. The the new installer doesn't recognize them unless they have the mark so manually remove them and install again.

Checklist

• The change come with new or modified tests
• Hard-to-understand functions have explanatory comments
• End-user documentation is updated to reflect the change

[zifeo]

Sweet! Is not there a better way to distribute the dist for the GitHub action? e.g. a different branch of something similar?

[Yohe-Am]

a different branch of something similar?

The docs recommend using a separate repo. Create metatypedev/setup-ghjk?

Also, a bit early but it might be best to maintain the ports themselves in a separate repo. Most of them anyways, some can stay in the core.

Note: just slashed the diff in half but it's still hefty. This isn't minified so we shouldn't see big diffs here going fwd.