4073 [image_picker] Migrate image_picker to package:cross_file (cla: yes, waiting for tree to go green, p: image_picker)

4075 Add link to the version update entry (cla: yes, waiting for tree to go green)

4077 [in_app_purchase] billingClient launchPriceChangeConfirmationFlow (cla: yes, waiting for tree to go green, p: in_app_purchase, platform-android)

4081 [video player]: update the url in the readme example (cla: yes, waiting for tree to go green, p: video_player)

4085 [in_app_purchase] Add support for SKPaymentQueueDelegate and showPriceConsentIfNeeded (cla: yes, waiting for tree to go green, p: in_app_purchase, platform-ios)