Expand MusicBrainz support to be much more comprehensive

src/mpd_now_playable/song/song.py

@@ -0,0 +1,32 @@
+from dataclasses import dataclass
+from enum import StrEnum
+from pathlib import Path
+
+from .artwork import Artwork
+from .musicbrainz import MusicBrainzIds
+
+
+class PlaybackState(StrEnum):
+	play = "play"
+	pause = "pause"
+	stop = "stop"
+
+
+@dataclass(slots=True)
+class Song:
+	state: PlaybackState
+	queue_index: int
+	queue_length: int
+	file: Path
+	title: str | None
+	artist: list[str]
+	composer: list[str]
+	album: list[str]
+	album_artist: list[str]
+	track: int | None
+	disc: int | None
+	genre: list[str]
+	duration: float
+	elapsed: float
+	art: Artwork
+	musicbrainz: MusicBrainzIds