✨ Add ability to use as stand-alone pre-commit hook

[s-weigand]

Hey thanks for the cool project ❤️

Since I want to replace darglint in my pre-commit configs with your project (so tired of waiting on docs to lint) it would be nice to integrate it as a stand-alone hook rather than adding it to flake8 (my current workaround).

Especially since I want to replace flake8 with ruff anyway and darglint was the last big blocker.

[jsh9]

Hi @s-weigand , thank you so much for creating this PR!

I added some comments, and merged in the latest changes in main for you.

You mentioned that you'd like to use pydoclint as a standalone hook rather than with flake8. That's fine, but please note that if you used it outside flake8, you wouldn't be able to use in-line omission (# noqa: DOCxxx): https://github.com/jsh9/pydoclint/blob/f2ffab506ad28bff9436e0d45f09b2228801026b/README.md

If you'd like to have both (pydoclint + ability to do in-line omission), here's a trick: create an environment with just pydoclint and then run flake8 --select=DOC <FILES>.

[jsh9]

Hi @s-weigand , thanks again! I'm merging this PR as "fixed".