Add autodiscovery for Jellyfin servers (#1146)

* Add autodiscovery for Jellyfin servers

* Remove debugging aids

you didn't see anything

* Fix linter errors

* Send a discovery packet to localhost too

src/shared/types/types.ts

@@ -166,6 +166,12 @@ export enum TableColumn {
     YEAR = 'releaseYear',
 }
 
+export type DiscoveredServerItem = {
+    name: string;
+    type: ServerType;
+    url: string;
+};
+
 export type GridCardData = {
     cardControls: any;
     cardRows: CardRow<Album | AlbumArtist | Artist | Playlist | Song>[];