Callback function used to pass single notification back
into C++ land for Notification.get return data.
| id: | a uuid for this notification |
| title: | the notification title |
| dir: | the notification direction, possible values are "ltr", "rtl", "auto" |
| lang: | the notification language |
| body: | the notification body |
| tag: | the notification tag |
Callback function used to notify C++ the we have returned
all notification objects for this Notification.get call.