registerLaunchersWithActivityResultCaller
abstract fun registerLaunchersWithActivityResultCaller(activityResultCaller: ActivityResultCaller, activityResultCallback: ActivityResultCallback<PaymentFlowResult.Unvalidated>)
Register the ActivityResultLaunchers with the new ActivityResultCaller and callback.
ActivityResultCaller is usually an Activity or Fragment instance, this method needs to be called from Activity.onCreate to make sure that during configuration change, the new Activity instance correctly registers for launchers and the old instance is correctly GC-ed.