Stream processing support

[eambrosio]

It would be amazing to provide a streaming processing tool in order to be able to analyze and process the generated data in real time. Taking advantage that we are using Kafka, we could use its new Kafka Streams features.
Some use cases could be:

• processing music data to provide what the most listened songs are, what the most listened genres are by zone, what the favorite time to listening music is, and so on...
• processing log traces to provide how many errors, by geolocation, there are in order to send alerts based on n errors per hour, ...