feat(mobile): Home screen customization options (#1563)

* Try staggered layout for home page

* Introduce setting for dynamic layout

* Fix some provider related bugs

* Make asset grouping configurable

* Add translation keys, refactor group title

* Rename enum values

* Fix enum names

* Reformat long if statement

* Fix timezone related bug

* Minor clean up

* Fix unit test

* Add second assets check back to home screen

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

@@ -6,6 +6,8 @@ enum AppSettingsEnum<T> {
   loadOriginal<bool>("loadOriginal", false),
   themeMode<String>("themeMode", "system"), // "light","dark","system"
   tilesPerRow<int>("tilesPerRow", 4),
+  dynamicLayout<bool>("dynamicLayout", false),
+  groupAssetsBy<int>("groupBy", 0),
   uploadErrorNotificationGracePeriod<int>(
     "uploadErrorNotificationGracePeriod",
     2,