FWebpushNotification constructor
      
      FWebpushNotification({ 
    
    
- String? title,
- Map<String, Object?> ? customData,
- List<FWebpushNotificationAction> ? actions,
- String? badge,
- String? body,
- Object? data,
- FWebpushNotificationDirection? dir,
- String? icon,
- String? image,
- String? lang,
- bool? renotify,
- bool? requireInteraction,
- bool? silent,
- String? tag,
- int? timestamp,
- List<num> ? vibrate,
Implementation
FWebpushNotification({
  this.title,
  this.customData,
  this.actions,
  this.badge,
  this.body,
  this.data,
  this.dir,
  this.icon,
  this.image,
  this.lang,
  this.renotify,
  this.requireInteraction,
  this.silent,
  this.tag,
  this.timestamp,
  this.vibrate,
});