New files:
* `reorderable_knowledge_panel_page.dart`: Page where the user can reorder the Knowledge Panel Cards.
* `reordered_knowledge_panel_cards.dart`: Knowledge Panel Cards as reordered by the user.
* `standard_knowledge_panel_page.dart`: Knowledge Panel Cards as provided by the server.

Impacted files:
* `app_en.arb`: added a "reorder the attributes" label
* `knowledge_panel_card.dart`: added an `isClickable` parameter to be get rid of the click icon+effect when reordering attributes
* `knowledge_panel_expanded_card.dart`: added an `isClickable` parameter
* `knowledge_panel_group_card.dart`: added an `isClickable` parameter
* `knowledge_panel_page.dart`: explicitly setting `isClickable: true`
* `knowledge_panels_builder.dart`: added an `isClickable` parameter
* `new_product_page.dart`: now using a dev-mode flag to determine if we display the reorder feature; moved code to new class `StandardKnowledgePanelCards`
* `pubspec.lock`: wtf
* `score_card.dart`: unrelated minor refactoring
* `user_preferences.dart`: added the user ordered attribute list as preference
* `user_preferences_dev_mode.dart`: added a flag for user reordered attribute feature