max_fields_count property Null safety

1. face_sdk
2. face_sdk
3. StructStorageFields
4. max_fields_count property

StructStorageFields class

1. Constructors
2. StructStorageFields
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static properties
12. license_state_android_app_id_t
13. license_state_android_serial_t
14. license_state_hardware_reg_t
15. license_state_ios_app_id_t
16. license_state_licenses_count_t
17. license_state_licenses_in_use_counts_int16_t
18. license_state_licenses_names_int16_t
19. license_state_licenses_total_counts_int16_t
20. license_state_online_t
21. max_fields_count
22. video_worker_active_liveness_confirmed_samples_t
23. video_worker_active_liveness_score_samples_t
24. video_worker_active_liveness_type_samples_t
25. video_worker_best_qaulity_frame_id_t
26. video_worker_best_quality_sample_t
27. video_worker_best_quality_t
28. video_worker_best_quality_template_t
29. video_worker_depth_liveness_confirmed_samples_t
30. video_worker_detector_confirmed_samples_t
31. video_worker_first_frame_id_t
32. video_worker_frame_id_t
33. video_worker_good_angles_samples_t
34. video_worker_good_face_size_samples_t
35. video_worker_good_light_and_blur_samples_t
36. video_worker_ir_liveness_confirmed_samples_t
37. video_worker_last_frame_id_t
38. video_worker_match_found_callback_t
39. video_worker_quality_t
40. video_worker_samples_count_t
41. video_worker_samples_quality_t
42. video_worker_samples_t
43. video_worker_samples_track_age_gender_set_t
44. video_worker_samples_track_age_t
45. video_worker_samples_track_age_years_t
46. video_worker_samples_track_emotions_confidence_t
47. video_worker_samples_track_emotions_count_t
48. video_worker_samples_track_emotions_emotion_t
49. video_worker_samples_track_emotions_set_t
50. video_worker_samples_track_gender_t
51. video_worker_search_result_element_ids_t
52. video_worker_search_result_match_result_distance_t
53. video_worker_search_result_match_result_fa_r_t
54. video_worker_search_result_match_result_fr_r_t
55. video_worker_search_result_match_result_score_t
56. video_worker_search_result_person_ids_t
57. video_worker_search_result_size_t
58. video_worker_sti_person_id_set_t
59. video_worker_sti_person_id_t
60. video_worker_stream_id_t
61. video_worker_templ_t
62. video_worker_template_created_callback_t
63. video_worker_track_id_t
64. video_worker_tracking_callback_t
65. video_worker_tracking_lost_callback_t
66. video_worker_tracking_sti_callback_t
67. video_worker_weak_samples_t