Notification class

1. Constructors
2. Notification
3. Properties
4. actions
5. badge
6. body
7. data
8. dir
9. icon
10. image
11. lang
12. onClick
13. onClose
14. onError
15. onShow
16. renotify
17. requireInteraction
18. silent
19. tag
20. timestamp
21. title
22. vibrate
23. hashCode
24. on
25. runtimeType
26. Methods
27. close
28. addEventListener
29. dispatchEvent
30. noSuchMethod
31. removeEventListener
32. toString
33. Operators
34. operator ==
35. Static properties
36. maxActions
37. permission
38. supported
39. Static methods
40. requestPermission
41. Constants
42. clickEvent
43. closeEvent
44. errorEvent
45. showEvent