feat!: add adapter system for database store

[Julien-R44]

This PR decouples Knex from the bentocache database driver.

The database store now takes an adapter as parameter, and we ship two builtin adapters: Knex and Kysely.
Others will be able to make a prisma/drizzle or other adapter if required quite easily, just by implementing the DatabaseAdapter interface.

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This results in multiples breaking changes:

• the test suite has changed its API. You now have to go through createStore to pass your driver.
• all mysqlDriver, sqliteDriver etc... have been removed: only knexDriver and kyselyDriver remain.
• the knex driver will no longer create the knex instance. you'll have to create the instance yourself to pass it on to the adapter.

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