use a separate table instead of a column on remote asset

mobile/lib/infrastructure/entities/remote_asset_cloud_id.entity.dart

@@ -0,0 +1,12 @@
+import 'package:drift/drift.dart';
+import 'package:immich_mobile/infrastructure/entities/remote_asset.entity.dart';
+import 'package:immich_mobile/infrastructure/utils/drift_default.mixin.dart';
+
+class RemoteAssetCloudIdEntity extends Table with DriftDefaultsMixin {
+  TextColumn get assetId => text().references(RemoteAssetEntity, #id, onDelete: KeyAction.cascade)();
+
+  TextColumn get cloudId => text().unique().nullable()();
+
+  @override
+  Set<Column> get primaryKey => {assetId};
+}