4256 [camera] Expand CameraImage DTO with properties for lens aperture, exposure time and ISO.  (cla: yes, waiting for tree to go green, p: camera, platform-ios, platform-android)

4258 [camera] Add Android & iOS implementations for pausing the camera preview  (cla: yes, waiting for tree to go green, p: camera, platform-ios, platform-android)

4284 Fix UNNECESSARY_TYPE_CHECK_TRUE. (cla: yes, waiting for tree to go green, p: in_app_purchase, platform-ios, platform-android)

4327 [camera] Bump minimum Flutter version and iOS deployment target (cla: yes, waiting for tree to go green, p: camera, platform-ios)