ACTION constant Null safety

1. airbridge_flutter_sdk
2. airbridge_flutter_sdk
3. AirbridgeAttribute
4. ACTION constant

AirbridgeAttribute class

1. Constructors
2. AirbridgeAttribute
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Constants
12. ACHIEVEMENT_ID
13. ACTION
14. AD_PARTNERS
15. CART_ID
16. CONTRIBUTION_MARGIN
17. CURRENCY
18. DATE_TIME
19. DESCRIPTION
20. IN_APP_PURCHASED
21. IS_FIRST_PER_USER
22. IS_RENEWAL
23. IS_REVENUE
24. LABEL
25. LEVEL
26. LIST_ID
27. MAX_RATE
28. PERIOD
29. PLACE
30. PRODUCT_BRAND_ID
31. PRODUCT_BRAND_NAME
32. PRODUCT_CATEGORY_ID
33. PRODUCT_CATEGORY_NAME
34. PRODUCT_CURRENCY
35. PRODUCT_ID
36. PRODUCT_LIST_ID
37. PRODUCT_NAME
38. PRODUCT_POSITION
39. PRODUCT_PRICE
40. PRODUCT_QUANTITY
41. PRODUCTS
42. QUERY
43. RATE
44. RATE_ID
45. RENEWAL_COUNT
46. SCHEDULE_ID
47. SCORE
48. SHARED_CHANNEL
49. TOTAL_QUANTITY
50. TRANSACTION_ID
51. TRANSACTION_PAIRED_EVENT_CATEGORY
52. TRANSACTION_PAIRED_EVENT_TIMESTAMP
53. TRANSACTION_TYPE
54. TYPE
55. VALUE