Interest in adding type hints?

[RunDevelopment]

Hi! I would like to use gdown as a library, but I don't like the lack of type hints. Would you be interested in adding type hints to gdown?

If yes, then I would make a series of PRs to add type hints to gdown as well as setup pyright for the project's CI to ensure that type hints are enforced.

And just to show the usefulness of static type hints: I already tested the feasibility of adding type hints, which led to the discovery of #315.

[wkentaro]

I've just recently dropped the support of old Python versions.

And now I'm slowly adding type annotations.

I'm happy to go towards that direction.