Add typescript support for script files.

[ST-DDT]

Is your feature request related to a problem? Please describe.

All my source is typescript except for the ones for githup-script.

Describe the solution you'd like

Add support for loading typescript files.

Describe alternatives you've considered

Run the typescript compiler to convert the ts file to a js file before executing it with this action.

Additional context

[nomeata]

This would also allow to statically check these scripts before running, e.g. help with rhysd/actionlint#55. This would have prevented plenty of mishaps that I caused…

[Flydiverny]

As a PoC I made a wrapper around github-script to use typescript sources https://github.com/Flydiverny/github-typescript it adds a small overhead as it uses esbuild binary to convert into JS.