Get album info (when available) from Last.fm, add getAlbumInfo endpoint (#2061)

* lastfm album.getInfo, getAlbuminfo(2) endpoints

* ... for description and reduce not found log level

* address first comments

* return all images

* Update migration timestamp

* Handle a few edge cases

* Add CoverArtPriority option to retrieve albumart from external sources

* Make agents methods more descriptive

* Use Last.fm name consistently

Co-authored-by: Deluan <deluan@navidrome.org>

server/subsonic/api.go

@@ -83,6 +83,8 @@ func (api *Router) routes() http.Handler {
 		h(r, "getArtist", api.GetArtist)
 		h(r, "getAlbum", api.GetAlbum)
 		h(r, "getSong", api.GetSong)
+		h(r, "getAlbumInfo", api.GetAlbumInfo)
+		h(r, "getAlbumInfo2", api.GetAlbumInfo)
 		h(r, "getArtistInfo", api.GetArtistInfo)
 		h(r, "getArtistInfo2", api.GetArtistInfo2)
 		h(r, "getTopSongs", api.GetTopSongs)
@@ -162,7 +164,6 @@ func (api *Router) routes() http.Handler {
 
 	// Not Implemented (yet?)
 	h501(r, "jukeboxControl")
-	h501(r, "getAlbumInfo", "getAlbumInfo2")
 	h501(r, "getShares", "createShare", "updateShare", "deleteShare")
 	h501(r, "getPodcasts", "getNewestPodcasts", "refreshPodcasts", "createPodcastChannel", "deletePodcastChannel",
 		"deletePodcastEpisode", "downloadPodcastEpisode")