Refactor: bundle, typescript, formatting, node20

[ndelangen]

• migrate to typescript
• use pnpm for installing node_modules
• add prettier for formatting
• add a github action for testing
• move code into root of repo

[ndelangen]

Would you be open to this PR?

I can revert the renames.

[pietrobolcato]

totally, that's awesome! thanks for the great work and taking the time 🙏
as we're already implementing some testing in gha, what about making it a unit test that can be run locally too, and the workflow could become a very simple CI that ensures always the keys etc are read correctly?

[rodrigo-oliveira-silva]

Hi guys,

Is there an estimate for this pull request to be completed?

[dorz-saymine]

Hi,
Any update?

[ndelangen]

You might want to use my fork till I get around to re-doing this PR:
https://github.com/ndelangen/action-read-yaml