GenServer responsible for checking if a new migration version is available for Kanta.

This module runs a version check when started to compare the current database migration version against the latest available version. If a newer version is available, it displays a formatted warning message in the console with:

• Current and latest version numbers
• Step-by-step instructions for updating
• Commands to generate and run the required migrations

The checker supports both PostgreSQL and SQLite3 databases and automatically detects which adapter is being used.