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/providers/permission.provider.dart

@@ -0,0 +1,44 @@
+import 'dart:io';
+
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:permission_handler/permission_handler.dart';
+
+class NotificationPermissionNotifier extends StateNotifier<PermissionStatus> {
+  NotificationPermissionNotifier() :
+    super(Platform.isAndroid
+      ? PermissionStatus.granted
+      : PermissionStatus.restricted,
+    ) {
+    // Sets the initial state
+    getNotificationPermission().then((p) => state = p);
+  }
+
+  /// Requests the notification permission
+  /// Note: In Android, this is always granted
+  Future<PermissionStatus> requestNotificationPermission() async {
+     final permission = await Permission.notification.request();
+     state = permission;
+     return permission;
+  }
+
+  /// Whether the user has the permission or not
+  /// Note: In Android, this is always true
+  Future<bool> hasNotificationPermission() {
+    return Permission.notification.isGranted;
+  }
+
+  Future<PermissionStatus> getNotificationPermission() async {
+    final status = await Permission.notification.status;
+    state = status;
+    return status;
+  }
+
+  /// Either the permission was granted already or else ask for the permission
+  Future<bool> hasOrAskForNotificationPermission() {
+    return requestNotificationPermission().then((p) => p.isGranted);
+  }
+
+}
+final notificationPermissionProvider
+  = StateNotifierProvider<NotificationPermissionNotifier, PermissionStatus>
+    ((ref) => NotificationPermissionNotifier());