chore: apply linter to the various example and test directories (#550)

* chore: remove examples and tests from analysis exclusion

* chore: apply linter fixes to stream_chat_flutter_core/example/main.dart

* chore: apply linter fixes to stream_chat_flutter/example/main.dart

* chore: apply linter fixes to stream_chat_persistence/example/main.dart

* chore: apply linter fixes to stream_chat/example/main.dart

* chore: apply linter fixes to stream_chat_flutter/example/split_view.dart

* chore: renamte tutorial files per linter

* chore: apply linter fixes to tutorial_part_1.dart

* chore: apply linter fixes to tutorial_part_2.dart

* chore: apply linter fixes to tutorial_part_3.dart

* chore: apply linter fixes to tutorial_part_4.dart

* chore: apply linter fixes to tutorial_part_5.dart

* chore: make a widget const in tutorial_part_5.dart

* chore: apply linter fixes to tutorial_part_6.dart

* chore: sort and update dependencies in stream_chat_persistence/example/pubspec.yaml

* chore: sort and update dependencies in stream_chat_flutter_core/example/pubspec.yaml

* chore: sort and update dependencies in stream_chat_flutter/example/pubspec.yaml

* chore: sort dependencies in stream_chat_flutter/example/pubspec.yaml

* chore: apply linter fixes to channel_test.dart

* chore: apply linter fixes to client_test.dart

* chore: apply linter fixes to client_test.dart, stream_http_client_test.dart, and token_manager_test.dart

* chore: apply linter fixes to filter_test.dart

* chore: apply linter fixes to reaction_test.dart

* chore: apply linter fixes to chat_persistence_client_test.dart

* chore: apply linter fixes to channel_image_test.dart

* chore: apply linter fixes to deleted_message_test.dart

* chore: apply linter fixes to full_screen_media_test.dart

* chore: apply linter fixes to gallery_footer_theme_test.dart

* chore: apply linter fixes to gallery_header_theme_test.dart

* chore: apply linter fixes to message_text_test.dart

* chore: apply linter fixes to reaction_bubble_test.dart

* chore: apply linter fixes to system_message_test.dart

* chore: apply linter fixes to typing_indicator_test.dart

* chore: apply linter fixes to channel_list_core_test.dart

* chore: apply linter fixes to channels_bloc_test.dart

* chore: apply linter fixes to lazy_load_scroll_view_test.dart

* chore: apply linter fixes to channel_matcher.dart

* chore: apply linter fixes to message_matcher.dart

* chore: apply linter fixes to users_matcher.dart

* chore: apply linter fixes to message_list_core_test.dart

* chore: apply linter fixes to message_search_bloc_test.dart

* chore: apply linter fixes to message_search_list_core_test.dart

* chore: apply linter fixes to stream_channel_test.dart

* chore: apply linter fixes to stream_chat_core_test.dart

* chore: apply linter fixes to user_list_core_test.dart

* chore: apply linter fixes to channel_query_dao_test.dart, message_mapper_test.dart, user_mapper_test.dart, and users_bloc_test.dart

* chore: apply some missed dartfmt

* test: regenerate failinggolden test

packages/stream_chat_persistence/test/src/mapper/message_mapper_test.dart

@@ -173,8 +173,8 @@ void main() {
     expect(entity.shadowed, message.shadowed);
     expect(entity.showInChannel, message.showInChannel);
     expect(entity.replyCount, message.replyCount);
-    expect(entity.mentionedUsers,
-        message.mentionedUsers.map((e) => jsonEncode(e)).toList());
+    expect(
+        entity.mentionedUsers, message.mentionedUsers.map(jsonEncode).toList());
     expect(entity.reactionScores, message.reactionScores);
     expect(entity.reactionCounts, message.reactionCounts);
     expect(entity.status, message.status);

packages/stream_chat_persistence/test/src/mapper/user_mapper_test.dart

@@ -39,7 +39,7 @@ void main() {
       lastActive: DateTime.now(),
       online: math.Random().nextBool(),
       banned: math.Random().nextBool(),
-      extraData: {'test_extra_data': 'extraData'},
+      extraData: const {'test_extra_data': 'extraData'},
     );
     final entity = user.toEntity();
     expect(entity, isA<UserEntity>());