refactor(shared): remove unused utils and their adapters

- Remove 'utils/utils.dart' export from shared.dart
- Delete country_adapter.dart and language_adapter.dart
- Remove unused Utils exports

Author: fulleni

lib/shared/shared.dart

@@ -1,3 +1,2 @@
 export 'extensions/extensions.dart';
-export 'utils/utils.dart';
 export 'widgets/widgets.dart';