chore(refactor): add a py.typed file

[jameslamb]

Contributes to #76 and #87.

Proposes adding a py.typed file, to advertise to type-checkers that this project contains inline type hints (i.e. doesn't ship a separate package of type stubs).

This is described in PEP 561: https://peps.python.org/pep-0561/

Package maintainers who wish to support type checking of their code MUST add a marker file named py.typed to their package supporting typing.

This didn't really matter when rapids-dependency-file-generator was only being used as a CLI, but now that rapids-build-backend is consuming it as a library, I think this is useful to have. It means that mypy, pyright, etc. used to check rapids-build-backend will also consider rapids_dependency_file_generator's type hints.

How I tested this

Built a wheel and confirmed that this file made it in with my MANIFEST.in changes here.

python -m build .
unzip -l ./dist/rapids_dependency_file_generator-1.13.5-py3-none-any.whl

[bdice]

Do we need to add mypy to the pre-commit hooks? I glanced over PEP 561, thanks for the context since this is unfamiliar to me.

[jameslamb]

Do we need to add mypy to the pre-commit hooks?

I think we should, but it'll take a bit of work to get there. I documented that in #87 and am gonna keep chipping away it this week while waiting on builds for other projects.

[GPUtester]

🎉 This PR is included in version 1.13.6 🎉

The release is available on:

• GitHub release
• PyPI release
• Conda release - rapidsai
• Conda release - rapidsai-nightly

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