Add GET /api/v1/statistics/soundtracks with every soundtrack and its songs

The other soundtrack statistics are capped at 100, so a client that shows every soundtrack (the MusicPlayer statistics tab) had no way to get them all. This one has no limit and is sorted by name.

internal/db/repository/querier.go

@@ -31,6 +31,8 @@ type Querier interface {
 	FindSongsFromSoundtrack(ctx context.Context, soundtrackID int32) ([]Song, error)
 	GetActiveSongByUUID(ctx context.Context, argUuid uuid.UUID) (GetActiveSongByUUIDRow, error)
 	GetAllSoundtracksIncludingDeleted(ctx context.Context) ([]Soundtrack, error)
+	// Every soundtrack with its songs, by name
+	GetAllSoundtracksWithSongs(ctx context.Context) ([]GetAllSoundtracksWithSongsRow, error)
 	GetIdBySoundtrackName(ctx context.Context, soundtrackName string) (int32, error)
 	// Last played soundtracks (most recently played)
 	GetLastPlayedSoundtracks(ctx context.Context, limit int32) ([]GetLastPlayedSoundtracksRow, error)