Enable TypeScript declaration files

[bexnoss]

Description:
This PR enables the generation of TypeScript declaration files.

Related issue:
Improves the workaround from #38 (comment).

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[pzhlkj6612]

One more step: make git track the generated ".d.ts" and ".d.ts.map" files.

[bexnoss]

I didn't notice that dist/ is tracked. This also simplifies the workaround in #38. Thanks for the heads up!

[bexnoss]

This is blocked by the usage of ncc for building. See #306

[dmitry-shibanov]

Hello @bexnoss. Thank you for your pull request. Would the initial issue be resolved by changing the build command to: tsc && ncc build -o dist/setup src/setup-python.ts && ncc build -o dist/cache-save src/cache-save.ts?

[bexnoss]

Hello @bexnoss. Thank you for your pull request. Would the initial issue be resolved by changing the build command to: tsc && ncc build -o dist/setup src/setup-python.ts && ncc build -o dist/cache-save src/cache-save.ts?

Hello, yes running tsc is what's missing for the workaround from #38 to work.

[bexnoss]

Superseded by #329