feat: saveToken plugin for app groups on iOS

This will allow the share extension to access the Bearer token to send
images to the backend.

frontend/src-tauri/src/lib.rs

@@ -58,6 +58,8 @@ pub fn android() {
         .plugin(tauri_plugin_store::Builder::new().build())
         .plugin(tauri_plugin_http::init())
         .plugin(tauri_plugin_sharetarget::init())
+        #[cfg(target_os = "ios")]
+        .plugin(tauri_plugin_ios_shared_token::init())
         .setup(|app| {
             log::info!("running things!");
             setup_window(app)?;