docs: [FC-0074] enrich docstrings following a template with more details

[mariajgrimaldi]

Description

This PR modifies the docstrings of all current filters by adding:

• Better descriptions of their purpose.
• Typing hints.
• Filter type embedded in the docstring to be reflected in the docs generated by RTD.
• Trigger information to locate the filter in the corresponding services.

Supporting information

This PR addresses a concern raised by this PR removing hooks docs from edx-platform: openedx/edx-platform#35921 (comment), where the table referencing where each event was triggered from was dropped.

Testing instructions

You can review the changes here: https://docsopenedxorg--246.org.readthedocs.build/projects/openedx-filters/en/246/reference/filters.html

Deadline

None

Checklists

Check off if complete or not applicable:

Merge Checklist:

• All reviewers approved
• Reviewer tested the code following the testing instructions
• CI build is green
• Version bumped
• Changelog record added with short description of the change and current date
• Documentation updated (not only docstrings)
• Code dependencies reviewed
• Fixup commits are squashed away
• Unit tests added/updated
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

Post Merge:

• Create a tag
• Create a release on GitHub
• Check new version is pushed to PyPI after tag-triggered build is
  finished.
• Delete working branch (if not needed anymore)
• Upgrade the package in the Open edX platform requirements (if applicable)

[openedx-webhooks]

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[sarina]

I think generally it is better practice to separate commits from changes from commits with version upgrades, it looks like you've done it all in one commit. But I am not going to block on this feedback.

[BryanttV]

Same as above

[mariajgrimaldi]

@BryanttV @sarina: thank you both for the review!

Bryann, you can review again :)

[mariajgrimaldi]

Comment to reviewers: The type-hint annotations are for documentation only for now. In another PR, I'll add the additional mypy checks. So there will probably be more changes around this. Thanks for the patience!

[BryanttV]

Thanks for addressing my comments! @mariajgrimaldi. Only a few additional changes are needed.

[mariajgrimaldi]

Thank you for all the help, @BryanttV! I'm going to merge this PR now. Once I open PR #250, we can address any other type of suggestion or improvement, I'll make sure to tag you there when I do.