87976 feat: migrate macos/application_package.dart to null-safety (tool, cla: yes, waiting for tree to go green)

87991 Add dartPluginClass support for Android and iOS (tool, cla: yes, waiting for tree to go green)

88013 Refactor iOS integration_test API to support Swift, dynamically add native tests (platform-ios, cla: yes, waiting for tree to go green, integration_test)

88015 feat: migrate base/dds.dart to null-safety (tool, cla: yes, waiting for tree to go green)

88019 add ? in Checkbox onChanged property (framework, f: material design, cla: yes, waiting for tree to go green)

88030 Deferred components integration test app (team, platform-android, framework, cla: yes, t: flutter driver, waiting for tree to go green, integration_test)