[Feature Request] Read CD number metadata

[Surax98]

I am ripping my CDs / Vynils and encode them in FLAC. There's a metadata storing the CD number (for example CD 1 of 2) and reading that metadata can be helpful to catalog albums. I only tried with FLACs, I don't know if you already included this kind of support for other codecs. I am attaching a screenshot taken from Symphonium as a comparison, if it can be helpful.