feat: upgrade to tauri 2.0

Steps taken:
1. install tauri via cargo install tauri-cli
2. see errors when running cargo tauri build
3. run cargo tauri migrate as recommended by docs https://tauri.app/start/migrate/from-tauri-1/
4. manually fix some .ts includes as recommeneded by docs https://tauri.app/start/migrate/from-tauri-1/#migrate-to-core-module
5. successfully build using cargo tauri build

desktop/src-tauri/src/main.rs

@@ -391,6 +391,7 @@ async fn start() {
     let state = State::new(init_logging_result).await;
 
     tauri::Builder::default()
+        .plugin(tauri_plugin_shell::init())
         .manage(state)
         .invoke_handler(tauri::generate_handler![
             torrents_list,