Integrate BenchmarkService into main.dart with Provider

This commit integrates the `BenchmarkService` into the main application setup through the `MultiProvider` in `main.dart`. The changes include:

1. Adding `BenchmarkService` to the list of service providers, allowing it to be accessible throughout the application via dependency injection.

2. Using `ProxyProvider` to ensure `BenchmarkService` gets the `RestApiUtility` instance as a dependency.

3. Modifying the `MyApp` class to fetch the `BenchmarkService` from the provider, making it ready for use in the application's lifecycle.

This addition allows `BenchmarkService` to be centrally managed and readily available for any part of the application that requires benchmark-related functionalities.

frontend/lib/main.dart

@@ -1,12 +1,16 @@
-import 'package:auto_gpt_flutter_client/viewmodels/api_settings_viewmodel.dart';
-import 'package:auto_gpt_flutter_client/viewmodels/skill_tree_viewmodel.dart';
 import 'package:flutter/material.dart';
 import 'views/main_layout.dart';
 import 'package:provider/provider.dart';
+
 import 'package:auto_gpt_flutter_client/viewmodels/task_viewmodel.dart';
 import 'package:auto_gpt_flutter_client/viewmodels/chat_viewmodel.dart';
+import 'package:auto_gpt_flutter_client/viewmodels/skill_tree_viewmodel.dart';
+import 'package:auto_gpt_flutter_client/viewmodels/api_settings_viewmodel.dart';
+
 import 'package:auto_gpt_flutter_client/services/chat_service.dart';
 import 'package:auto_gpt_flutter_client/services/task_service.dart';
+import 'package:auto_gpt_flutter_client/services/benchmark_service.dart';
+
 import 'package:auto_gpt_flutter_client/utils/rest_api_utility.dart';
 
 // TODO: Update documentation throughout project for consistency
@@ -25,6 +29,10 @@ void main() {
           update: (context, restApiUtility, taskService) =>
               TaskService(restApiUtility),
         ),
+        ProxyProvider<RestApiUtility, BenchmarkService>(
+          update: (context, restApiUtility, taskService) =>
+              BenchmarkService(restApiUtility),
+        ),
         ChangeNotifierProxyProvider<RestApiUtility, ApiSettingsViewModel>(
           create: (context) => ApiSettingsViewModel(
               Provider.of<RestApiUtility>(context, listen: false)),
@@ -43,6 +51,8 @@ class MyApp extends StatelessWidget {
     // Fetch services from providers
     final chatService = Provider.of<ChatService>(context, listen: false);
     final taskService = Provider.of<TaskService>(context, listen: false);
+    final benchmarkService =
+        Provider.of<BenchmarkService>(context, listen: false);
     taskService.loadDeletedTasks();
 
     return MaterialApp(
@@ -57,7 +67,7 @@ class MyApp extends StatelessWidget {
           ChangeNotifierProvider(
               create: (context) => TaskViewModel(taskService)),
           ChangeNotifierProvider(
-            create: (context) => SkillTreeViewModel(),
+            create: (context) => SkillTreeViewModel(benchmarkService),
           ),
         ],
         child: MainLayout(),