feat: [FC-0074] add inline code annotation linter for Open edX Events

[mariajgrimaldi]

Description:

This PR adds a linter for events code-annotations to find missing required fields like: name, type, data and description for Open edX Events. If any of these fields are missing, then a quality error is raised.

You can see it working in this PR: openedx/openedx-events#448 by running pylint openedx_events/learning/signals.py:

This linter aims to enforce the standard of in-line code annotations for developers to follow when documenting events definitions in the openedx-events (and others) repositories.

I'm open to moving this directly into the openedx-events repo if needed, considering that the linter is kind of specific to that repository.

Merge checklist:

• All reviewers approved
• CI build is green
• If adding new checks, followed how_tos/0001-adding-new-checks.rst
• Changelog record added (if needed)
• Documentation updated (not only docstrings) (if needed)
• Commits are squashed

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[sarina]

This looks good to me, but I don't know this repo well (and am not a CC on it) so I can't provide an approving review.

[mariajgrimaldi]

Thank you, @sarina. I'll tag @openedx/axim-engineering as the owners according to the catalog-info.yaml.