fullScreenIntent property Null safety
Specifies whether the notification should launch a full-screen intent as soon as it triggers.
Note: The system UI may choose to display a heads-up notification,
instead of launching your full-screen intent, while the user is using the
device. When the full-screen intent occurs, the plugin will act as though
the user has tapped on a notification so handle it the same way
onSelectNotification callback) to display the appropriate
page for your application.
final bool fullScreenIntent;