feature(mobile): sync assets, albums & users to local database on device (#1759)

* feature(mobile): sync assets, albums & users to local database on device

* try to fix tests

* move DB sync operations to new SyncService

* clear db on user logout

* fix reason for endless loading timeline

* fix error when deleting album

* fix thumbnail of device albums

* add a few comments

* fix Hive box not open in album service when loading local assets

* adjust tests to int IDs

* fix bug: show all albums when Recent is selected

* update generated api

* reworked Recents album isAll handling

* guard against wrongly interleaved sync operations

* fix: timeline asset ordering (sort asset state by created at)

* fix: sort assets in albums by created at

mobile/openapi/test/user_response_dto_test.dart

@@ -61,6 +61,11 @@ void main() {
       // TODO
     });
 
+    // String updatedAt
+    test('to test the property `updatedAt`', () async {
+      // TODO
+    });
+
     // String oauthId
     test('to test the property `oauthId`', () async {
       // TODO