Sync S2 playlist actions with Jellyfin server

[jacobrham]

💬 User story

As an S2 user
I want playlist actions (e.g. add, delete songs) to be synced with the Jellyfin server
So that changes I make to playlists in S2 are available across my Jellyfin clients.

📝 Notes

Right now S2 can import playlists but modifications made to those playlists within S2 are not reported back to the Jellyfin server. Thius means that any changes made to playlists in S2 will put those playlists out of sync with Jellyfin, creating a less cohesive experience for those who use multiple Jellyfin clients.

👩‍🔧 Technical Design Notes

Jellyfin exposes an API for interacting with playlists. They can be created, or modified by adding or removing songs, or moving them within the playlist.

https://api.jellyfin.org/#tag/Playlists/operation/AddToPlaylist