add disable customer function

lib/data/provider/user_data_provider.dart

@@ -80,4 +80,9 @@ class UserDataProvider {
     }
     return users;
   }
+
+  Future<void> enableUser(String userID, bool enabled) async {
+    return await requestAPI("/enable_user", "PUT",
+        payload: {"id": userID, "enabled": enabled}, token: await getToken());
+  }
 }