Feature request: filter queries by favorites only

Now that the favorites are implemented on (almost) all objects, the UI will need to be able to query the objects lists with a new QueryParams setting which would be onlyFavorites. It would be the same as includeMissing.

It should apply to all the queries which result type have a favorite field:

Media
Artist
Album
Genre
Playlist
Group
Folder

See #451 (closed) for the last 3 ones

Edited Nov 03, 2022 by Nicolas Pomepuy

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