Improve Jellyfin playlist loading and modification performance times (#2184)

* Remove unneeded Fields from getPlaylistSongList

* Add optimized controller function for playlist addition duplication checks

* Remove Jellyfin People data handling

* move artist map inline

---------

Co-authored-by: Kendall Garner <17521368+kgarner7@users.noreply.github.com>

src/renderer/api/subsonic/subsonic-controller.ts

@@ -1229,6 +1229,11 @@ export const SubsonicController: InternalControllerEndpoint = {
 
         return results.length;
     },
+    getPlaylistSongIds: async (args) =>
+        SubsonicController.getPlaylistSongList(args).then((result) => ({
+            ...result,
+            items: result.items.map((song) => song.id),
+        })),
     getPlaylistSongList: async ({ apiClientProps, query }) => {
         const res = await ssApiClient(apiClientProps).getPlaylist({
             query: {