19267 Annotate valuePublishedByPlugin with nullable (cla: yes, platform-ios, waiting for tree to go green)

19270 Enable lazy-async-stacks by-default in all modes (2) (cla: yes)

19320 Fix documentation of unset platform view ID (cla: yes)

19393 Clarify the relationship between PictureRecorder and Canvas (cla: yes, waiting for tree to go green)

19396 fuchsia: Remove dead code / break dependencies (affects: engine, cla: yes, code health, platform-fuchsia)

19458 Added the ability to set properties in interface builder for FlutterViewController (cla: yes, platform-ios)

19459 Implement cursor support for Windows (cla: yes)

19470 Set locale in Linux shell (cla: yes)