refactor(mobile): encapsulate most access to photomanager in repository (#12754)

* refactor(mobile): encapsulate most access to photomanager in repository

mobile/lib/interfaces/file_media.interface.dart

@@ -0,0 +1,30 @@
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:immich_mobile/entities/asset.entity.dart';
+
+abstract interface class IFileMediaRepository {
+  Future<Asset?> saveImage(
+    Uint8List data, {
+    required String title,
+    String? relativePath,
+  });
+
+  Future<Asset?> saveVideo(
+    File file, {
+    required String title,
+    String? relativePath,
+  });
+
+  Future<Asset?> saveLivePhoto({
+    required File image,
+    required File video,
+    required String title,
+  });
+
+  Future<void> clearFileCache();
+
+  Future<void> enableBackgroundAccess();
+
+  Future<void> requestExtendedPermissions();
+}