Add Kamon instrumentation for logging to message traces and statistics

[kabirkbr]

Subtask of #13

[kabirkbr]

Unfortunately Kamon 1.0 documentation (here) is incomplete (or so it seems) and examples do not work, both in Java and Scala. All compiles and runs but there are no messages exposed on port 9095...

There is also an original example in https://github.com/kamon-io/kamon.io/tree/master/examples/kamon-akka-examples based on Kamon 0.6 -- should try to use older version until Kamon 1.0 documentation gets updated.

[kabirkbr]

Some more resources (again, on Kamon 0.6):
https://softwaremill.com/akka-monitoring-with-kamon-part-1/
https://www.emnify.com/blog/2018/02/01/monitoring-with-kamon-1-0

[kabirkbr]

Message traces are logged into Jaeger, statistics into Prometheus.