style(ads): reorder imports to improve organization

- Moved 'package:logging/logging.dart' import below 'app_environment' import
- This change improves the consistency of import ordering in the file

Author: fulleni

lib/ads/ad_service.dart

@@ -3,8 +3,8 @@ import 'package:flutter_news_app_mobile_client_full_source_code/ads/ad_provider.
 import 'package:flutter_news_app_mobile_client_full_source_code/ads/models/ad_theme_style.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/ads/models/inline_ad.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/ads/models/interstitial_ad.dart';
-import 'package:logging/logging.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/app/config/app_environment.dart';
+import 'package:logging/logging.dart';
 
 /// {@template ad_service}
 /// A service responsible for managing and providing ads to the application.