Jellyfin Integration

[Deide]

There have been suggestions for Plex and Navidrome, but I personally use Jellyfin, which is an open source fork of Emby.

How it would work:
  - Provide server url and login details
  - Grab music libraries and allow the user to toggle libraries on and off.
  - Sync to a local cache

Jellyfin API: https://api.jellyfin.org
Some prior art/libs:
  - (Go desktop client) https://github.com/dweymouth/supersonic and its api client https://github.com/dweymouth/go-jellyfin
  - (Official C# SDK) https://github.com/jellyfin/jellyfin-sdk-csharp
  - (Rust TUI client) https://github.com/dhonus/jellyfin-tui
  - (List of mostly open source clients): https://jellyfin.org/downloads/clients/all

Some extra things that could be considered:
  - Implement SyncPlay