feat: change password

lib/domain/user/repositories/i_user_repository.dart

@@ -2,4 +2,8 @@ part of '../user.dart';
 
 abstract class IUserRepository {
   Future<Either<UserFailure, User>> editUser({required String name});
+  Future<Either<UserFailure, Unit>> changePassword({
+    required String newPassword,
+    required String currentPassword,
+  });
 }