OEP-0080: Adopt the Openfeature Specifications in OpenEdX For Toggles and Feature Flags

[feoh]

This is VERY VERY DRAFT. Please don't merge.

Mostly just putting this here so I can have a way for Tobias to give me feedback.

[openedx-webhooks]

Thanks for the pull request, @feoh!

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[robrap]

[inform] If you decide to move forward with filling out this OEP, I think it would be useful to first become familiar with the current feature toggle documentation and tooling: https://edx.readthedocs.io/projects/edx-toggles/en/latest/readme.html.

[feoh]

Thank you very much. I was asked to author this and I appreciate all the help I can get!