feat(mobile): iOS background sync notifications (#1811)

* adds notification handling logic

* notification on background updates for iOS

* fixed regression where i accidentally removed load translations from the background sync

* fixed ios translations

---------

Co-authored-by: Marty Fuhry <marty@fuhry.farm>
Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/modules/settings/services/permission.service.dart

@@ -0,0 +1,21 @@
+import 'package:permission_handler/permission_handler.dart';
+
+/// This class is for requesting permissions in the app
+class PermissionService {
+  /// Requests the notification permission
+  /// Note: In Android, this is always granted
+  Future<PermissionStatus> requestNotificationPermission() {
+    return Permission.notification.request();
+  }
+
+  /// Whether the user has the permission or not
+  /// Note: In Android, this is always true
+  Future<bool> hasNotificationPermission() {
+    return Permission.notification.isGranted;
+  }
+
+  /// Either the permission was granted already or else ask for the permission
+  Future<bool> hasOrAskForNotificationPermission() {
+    return requestNotificationPermission().then((p) => p.isGranted);
+  }
+}