Add a ZeroMQ reporter

(suggested by @dukeboard)

We miss a message-based reporter to publish the power reports on a given channel (whose topic can be the PID) as we had in [BitWatts](https://github.com/Spirals-Team/bitwatts/blob/master/bitwatts-core/src/main/scala/org/powerapi/bitwatts/reporter/ThriftDisplay.scala). 
