feat: Update database with latest version and implement kanjis

[apomalyn]

Requirements

• The database should be updated to the latest version after each start-up of the application. That includes, for now,
  • kanas
  • kanjis
  • vocabulary

What needs to be done

• Implement the models and repository for kanas, kanji and vocabulary (see models on the API)
• Load the indexes of each data at the start-up of the application and update the database if needed. Don't forget to add version=[latest-db-version] on the query
  • groups: v1/groups
  • kanas: /v1/kanas
  • kanjis: /v1/kanjis?details=light ⚠️ limit the content using page[size] if needed
  • vocabulary: /v1/vocabulary?details=light ⚠️ limit the content using page[size] if needed