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/ios/Podfile

@@ -37,5 +37,66 @@ end
 post_install do |installer|
   installer.pods_project.targets.each do |target|
     flutter_additional_ios_build_settings(target)
+
+    # Permission macros for the permission_handler (https://pub.dev/packages/permission_handler)
+    # Start of the permission_handler configuration
+    # Remove the # character in front of the permission you do want to use.
+    target.build_configurations.each do |config|
+
+      # You can enable the permissions needed here. For example to enable camera
+      # permission, just remove the `#` character in front so it looks like this:
+      #
+      # ## dart: PermissionGroup.camera
+      # 'PERMISSION_CAMERA=1'
+      #
+      #  Preprocessor definitions can be found in: https://github.com/Baseflow/flutter-permission-handler/blob/master/permission_handler_apple/ios/Classes/PermissionHandlerEnums.h
+      config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
+        '$(inherited)',
+
+        ## dart: PermissionGroup.calendar
+        # 'PERMISSION_EVENTS=1',
+
+        ## dart: PermissionGroup.reminders
+        # 'PERMISSION_REMINDERS=1',
+
+        ## dart: PermissionGroup.contacts
+        # 'PERMISSION_CONTACTS=1',
+
+        ## dart: PermissionGroup.camera
+        # 'PERMISSION_CAMERA=1',
+
+        ## dart: PermissionGroup.microphone
+        # 'PERMISSION_MICROPHONE=1',
+
+        ## dart: PermissionGroup.speech
+        # 'PERMISSION_SPEECH_RECOGNIZER=1',
+
+        ## dart: PermissionGroup.photos
+        # 'PERMISSION_PHOTOS=1',
+
+        ## dart: [PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse]
+        # 'PERMISSION_LOCATION=1',
+
+        ## dart: PermissionGroup.notification
+        'PERMISSION_NOTIFICATIONS=1',
+
+        ## dart: PermissionGroup.mediaLibrary
+        # 'PERMISSION_MEDIA_LIBRARY=1',
+
+        ## dart: PermissionGroup.sensors
+        # 'PERMISSION_SENSORS=1',
+
+        ## dart: PermissionGroup.bluetooth
+        # 'PERMISSION_BLUETOOTH=1',
+
+        ## dart: PermissionGroup.appTrackingTransparency
+        # 'PERMISSION_APP_TRACKING_TRANSPARENCY=1',
+
+        ## dart: PermissionGroup.criticalAlerts
+        # 'PERMISSION_CRITICAL_ALERTS=1'
+      ]
+
+    end
+    # End of the permission_handler configuration
   end
-end
+end