We're hitting issues with people heavily hitting us with API queries that look through all recordings for an artist to find videos. This is awfully wasteful and seems like a legitimate thing to want in the first place, so we should have a way to do this more efficiently in the API in the same way we already do in the website's recording footer and, once MBS-12799 is merged, in the recording page filter.

We already have "inc=various-artists" for artist lookups where we want to return VA releases for the artist only, so we could have a similar inc=video_only option if we want to return just video, and possibly an inc=audio_only for just not videos.