favourite_provider library Null safety

1. riverpod_api
2. favourite_provider library

riverpod_api package

1. Libraries
2. app_colors
3. app_routes
4. app_text_styles
5. app_theme
6. assets.gen
7. dio_client
8. dio_exceptions
9. dio_interceptor
10. endpoints
11. favourite_page
12. favourite_provider
13. helper
14. home_btn
15. home_page
16. joke_api
17. joke_model
18. joke_page
19. joke_provider
20. joke_repository
21. joke_state
22. joke_state_provider
23. joke_view
24. main
25. preferences
26. product_api
27. product_model
28. product_provider
29. product_repository
30. product_state_notifier
31. products_page
32. refresh_joke
33. routes
34. shared_providers