Include both `Album Count` and `Random` sortings for the Artists page.
This change also fixes the Artist search feature in Jellyfin, which was
broken because of an open issue on Jellyfin [1]. The current workaround
is to do the filtering locally after receiving all results from Jellyfin
API.
Also, as the Jellyfin API doesn't include a sorting option for
`AlbumCount`, we need to disable pagination when that option is
selected, to receive all artists, and run the sorting locally.
[1] Related issue: https://github.com/jellyfin/jellyfin/issues/8222
Remove custom page implementation for Artists, and instead rely on the
generic `GridView` approach. This also simplifies adding new
sorting/filtering options as next improvements.
The new `ArtistFilter` is a dummy implementation without any real
filters at the moment.
Also, the `go-jellyfin` upgrade is needed to correctly display the album
count for each artist.
Drew Weymouth