Add Total Disc and Disc Number to tags if available

[Gamer4Life2020]

I found on multi-disc sets while it does put in separate folders, the total disc and disc numbers are not in the tags.
So when renaming or organizing with Picard it puts all the tracks in the same folder. No a huge deal as I can recheck or manually fix, but just a thought. Tags show as totaldisc and discnumber.

[vitiko98]

That's already included:

qobuz-dl/qobuz_dl/metadata.py

Lines 41 to 42 in bba6f3a

	if "Disc " in final_name:
	audio["DISCNUMBER"] = str(d["media_number"])