Add remaining model types and client methods

Models added:
- Disclaimer, ForeignAgent (credits.go)
- ArtistConcerts (concert.go)
- Dashboard, StationResult, Station, AdParams, GenerativeStream,
  GenerativeStreamData, GenerativeStreamInfo (radio.go)
- FileInfo, FileDownloadInfo, TrackFullInfo, SimilarTracks, TrackTrailer (track.go)
- Removed duplicate AdParams from feed.go

Client methods added:
- artists.go: GetArtistBriefInfo, GetArtistSimilar, GetArtistLinks,
  GetArtistAlsoAlbums, GetArtistDiscographyAlbums, GetArtistSafeDirectAlbums,
  GetArtistTrackIds, GetArtistAbout, GetArtistDonation, GetArtistInfo,
  GetArtistSkeleton, GetArtistTrailer
- albums.go: GetAlbumSimilarEntities, GetAlbumTrailer
- clips.go: GetClipsDisclaimer
- concerts.go: GetArtistConcerts, GetConcertSkeleton
- radio.go: GetRotorStationsDashboard, GetRotorStationsList,
  GetRotorStationInfo, GetRotorStationStream, GetRotorStationSettings
- supplements.go: GetTracksCredits, GetClipsCredits
- queue.go: GetQueuesList
- tracks.go: GetTracksFileInfo, GetTracksSimilar, GetTrackTrailer, GetTrackFullInfo

internal/models/feed.go

@@ -294,10 +294,3 @@ type Ad struct {
 	Duration    int    `json:"duration"`
 }
 
-// AdParams represents ad parameters.
-type AdParams struct {
-	BaseModel
-	Frequency int    `json:"frequency"`
-	MaxPerDay int    `json:"max_per_day"`
-	Targeting string `json:"targeting"`
-}