KEFCore: roadmap

The roadmap can be synthetized in the following points:

• [x] Create a first working provider starting from the code of InMemory provider
• [ ] Extends the first provider with new features able to create Apache Kafka Streams topology to retrieve information
• [x] Use KNetCompactedReplicator beside Apache Kafka Streams
• [x] Add external package to manage data serialization
• [x] Add Avro external package to manage data serialization
• [x] Add Templates package