models/feedback_request library

1. linklytics_feedback package
2. documentation
3. models/feedback_request.dart

linklytics_feedback package

1. Libraries
2. core/constants
3. core/feedback_strings
4. l10n/localization_service
5. l10n/translations
6. linklytics_feedback
7. models/feedback_request
8. models/feedback_response
9. services/api_service
10. view/feedback_controller
11. view/feedback_page