Impacted files:
* `add_basic_details_page.dart`: display "producer provided" icon for name, brands and quantity
* `nutrition_page_loaded.dart`: display "producer provided" icon for serving size and each individual nutrient
* `product_query.dart`: set the icon to display when a product field value is "producer provided"
* `smooth_autocomplete_text_field.dart`: added parameter `suffixIcon`
* `smooth_text_form_field.dart`: added parameter `suffixIcon`

New file:
* `owner_field_info.dart`: Standard info tile about "owner fields".

Impacted files:
* `add_basic_details_page.dart`: now displaying `OwnerFieldInfo` if relevant; minor refactoring
* `nutrition_page_loaded.dart`: now displaying `OwnerFieldInfo` if relevant; minor refactoring
* `product_query.dart`: moved field to new file `owner_field_info.dart`

Impacted files:
* add_basic_details_page.dart: added semantics
* app_en.arb: 2 new labels for "owner field info"
* nutrition_page_loaded.dart: added semantics
* owner_field_info.dart: translated labels