Feature Request: --annotation-source option

[ealgase]

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Description of your issue, suggested solution and other information

YouTube recently removed all old style annotations. An archive (hosted at archive.omar.yt) has sprung up as a replacement. A useful option to have would be to be able to choose between archive.omar.yt and youtube.com as the default annotation source. By default, YouTube should be the source, except for when downloading from dev.invidio.us (when archive.omar.yt should be the default).

Example syntax:
--annotation-source youtube downloads annotations from YouTube
--annotation-source invidious downloads annotations from archive.omar.yt
--annotation-source https://archive.omar.yt/api/v1/annotations/%(video_id)s uses the url https://archive.omar.yt/api/v1/annotations/VIDEO_ID as the annotations file that is downloaded.

[tech234a]

While I can understand the reasoning for this being out-of-scope for this project, I would like to point out that this archive provides access to data that previously existed on the official YouTube site until it was removed on January 15. While data is still currently returned from the old endpoint on YouTube, this data now consists of only cards, end screens, and creator logos to be displayed in the corner of the video, not the legacy annotations available from this archive. I feel that this feature should be supported because many people use youtube-dl for archival purposes, and this feature would further that use case.