Implement artifact routes for Incremental Cardano DB in aggregator REST API

[jpraynaud]

Why

We need to implement new HTTP routes in the REST API of the aggregator to support Incremental Cardano DB artifacts delivery.

What

Implement new routes for Incremental Cardano DB to retrieve the list of artifacts and artifacts details (by hash).

How

• Implement new route /artifact/cardano-database
• Implement new route /artifact/cardano-database/{hash}
• Extend the end to end test to check the certification of Incremental Cardano DB
• Update OpenAPI specs