Add a offline data manager

[teolemon]

What

• Create a screen to customize the offline database dump
  • Would require: Generate on-demand miniaturized dump of the database and images for an offline mode openfoodfacts-server#6328
  • Meanwhile @stephanegigandet suggests we experiment with : https://fr.openfoodfacts.org/api/v2/search?fields=code,product_name&page_size=1000
    • The transition to the new system will be transparent
• Download the Offline scan dump
  • Ensure this is fixed: Offline scan dump is partly broken (Nutri-Score field rename) openfoodfacts-server#4648
• Load it in the local database
• Implement a refresh mechanism Ensure the offline database stays fresh #2450
• Implement a double-response mechanism in the scan screen (first offline, then online refresh if network is available) #2451
• feat: Add offline mode data manager #2322

Part of

• 📶 🤳 Offline scanning (Tracker) #18