AirbridgeCategory constructor Null safety

1. airbridge_flutter_sdk
2. airbridge_flutter_sdk
3. AirbridgeCategory
4. AirbridgeCategory constructor

AirbridgeCategory class

1. Constructors
2. AirbridgeCategory
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Constants
12. ACHIEVE_LEVEL
13. AD_CLICK
14. AD_IMPRESSION
15. ADD_PAYMENT_INFO
16. ADD_TO_WISHLIST
17. ADDED_TO_CART
18. COMPLETE_TUTORIAL
19. HOME_VIEWED
20. INITIATE_CHECKOUT
21. ORDER_CANCELED
22. ORDER_COMPLETED
23. PRODUCT_LIST_VIEWED
24. PRODUCT_VIEWED
25. RATE
26. SCHEDULE
27. SEARCH_RESULTS_VIEWED
28. SHARE
29. SIGN_IN
30. SIGN_OUT
31. SIGN_UP
32. SPEND_CREDITS
33. START_TRIAL
34. SUBSCRIBE
35. UNLOCK_ACHIEVEMENT
36. UNSUBSCRIBE