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>

core/agents/lastfm/client.go

@@ -45,6 +45,20 @@ type Client struct {
 	hc     httpDoer
 }
 
+func (c *Client) AlbumGetInfo(ctx context.Context, name string, artist string, mbid string) (*Album, error) {
+	params := url.Values{}
+	params.Add("method", "album.getInfo")
+	params.Add("album", name)
+	params.Add("artist", artist)
+	params.Add("mbid", mbid)
+	params.Add("lang", c.lang)
+	response, err := c.makeRequest(ctx, http.MethodGet, params, false)
+	if err != nil {
+		return nil, err
+	}
+	return &response.Album, nil
+}
+
 func (c *Client) ArtistGetInfo(ctx context.Context, name string, mbid string) (*Artist, error) {
 	params := url.Values{}
 	params.Add("method", "artist.getInfo")