[google_maps_flutter] Fix iOS crash by observing map frame change onl…

…y once (flutter#3426)

[flutter_plugin_tool] Add custom-test command (flutter#5058)

[in_app_purchase] Implements transaction caching for StoreKit (flutte…

…r#4985)

[video_player] Rename internal method channels (flutter#5045)

[video_player] Rename internal method channels (flutter#5045)

[in_app_purchase] Adds additional explanation on the importance of co…

…mpleting a purchase (flutter#5017)

[file_selector] Update macOS README and example (flutter#5034)

[flutter_plugin_tools] Fix subpackage analysis (flutter#5027)

[image_picker] Fixes activity leak (flutter#4439)

[ci] Run analysis with older versions of Flutter (flutter#5000)