dismiss abstract method
Dismisses a single notification without canceling its respective schedule.
The id parameter is an int that represents the unique identifier of
the notification to dismiss. This method dismisses the notification only,
leaving its associated schedule intact.
If the notification is currently shown, it will be dismissed immediately. If the notification is not currently shown, this method has no effect.
This method returns a Future that resolves to void.
Implementation
Future<void> dismiss(int id);