init static method
Initializes Alarm services.
Also calls checkAlarm that will reschedule alarms that were set before app termination.
Implementation
static Future<void> init() async {
AlarmTriggerApiImpl.ensureInitialized(
alarmRang: alarmRang,
alarmStopped: _alarmStopped,
);
await AlarmStorage.init();
await checkAlarm();
}