* feat(mobile): passkey bridge for android
* fix(mobile): passkey plugin on the main engine only
* register it in configureFlutterEngine and cancel its scope on detach
* pass coroutine cancellation through instead of treating it as an error
* check for Play services 23.08+ before Android 14 in isSupported
* explain why NotAllowedError counts as a cancel
* share one perform function between register and authenticate