Support other databases for music library.

[konikvranik]

It looks like MA uses SQLite to store library data, which is extremely slow on my setup with NFS.
It would be nice to allow MA to also use other engines like Postgres and so on.
I saw a previous request from 2022 that is locked and not implemented, but IMHO it's back on the table again.

[konikvranik]

Actually, it blocks me from using MA. I like the project; I'd like to support it, but I cannot use it because the search is so slow, so it's unusable with SQLite.