refactor(mobile): more repositories (#12879)

* ExifInfoRepository
 * ActivityApiRepository
 * initial AssetApiRepository

mobile/lib/interfaces/asset_api.interface.dart

@@ -0,0 +1,16 @@
+import 'package:immich_mobile/entities/asset.entity.dart';
+
+abstract interface class IAssetApiRepository {
+  // Future<Asset> get(String id);
+
+  // Future<List<Asset>> getAll();
+
+  // Future<Asset> create(Asset asset);
+
+  Future<Asset> update(
+    String id, {
+    String? description,
+  });
+
+  // Future<void> delete(String id);
+}