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/test/asset_grid_data_structure_test.dart

@@ -13,14 +13,16 @@ void main() {
 
     testAssets.add(
       Asset(
-        deviceAssetId: '$i',
-        deviceId: '',
-        ownerId: '',
+        localId: '$i',
+        deviceId: 1,
+        ownerId: 1,
         fileCreatedAt: date,
         fileModifiedAt: date,
+        updatedAt: date,
         durationInSeconds: 0,
         fileName: '',
         isFavorite: false,
+        isLocal: false,
       ),
     );
   }