docs: add configuration for automatic filters docs generation

[mariajgrimaldi]

Description

This PR adds the necessary configuration for automatic docs generation based on Open edX Filters classes, you can see the docs generated here: https://docsopenedxorg--173.org.readthedocs.build/projects/openedx-filters/en/173/

[openedx-webhooks]

Thanks for the pull request, @mariajgrimaldi! Please note that it may take us up to several weeks or months to complete a review and merge your PR.

Feel free to add as much of the following information to the ticket as you can:

• supporting documentation
• Open edX discussion forum threads
• timeline information ("this must be merged by XX date", and why that is)
• partner information ("this is a course on edx.org")
• any other information that can help Product understand the context for the PR

All technical communication about the code itself will be done via the GitHub pull request interface. As a reminder, our process documentation is here.

Please let us know once your PR is ready for our review and all tests are green.

[mariajgrimaldi]

Hi @Ian2012 @felipemontoya! Here's a PR for better docs on the filters that are available. I'll also update the classes' docstrings so they have more meaningful content. But in the meantime, what do you think about the format? Is it enough info? What else should we add? Thanks!

[Ian2012]

LGTM

[felipemontoya]

Working as advertised. I think this is good for merging.

Another thing we should do is to make available the different versions on the docs page, but that is not related to this specific work.

[mariajgrimaldi]

Since I'm only changing documentation, I'll be merging as is even with the coverage failures.

[openedx-webhooks]

@mariajgrimaldi 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.