Persist the Status of the Service

[VincenzoFerme]

We currently handle the state of the service in memory, we need to discuss about a solution to serialise it so that it can survive to service restarts.

Update: we decided to rely on Minio for storing the state of this service as blob for now. As future work we should plan to evaluate the effectiveness of using Minio for such task (e.g., the files might be not readable) and decide if we want to move to a more structured way with a NoSQL database for example.