Add Actor monitoring and metrics using zio-metrics

[softinio]

No description provided.

[softinio]

@toxicafunk Can you help me write the description and requirements for this feature?

[toxicafunk]

With ZIO-Metrics we have the choice of using Prometheus Exporters or Dropwizard Reporters for monitoring. Prometheus comes with Default Exports which registers a number of HotSpot collectors to a given registry so it might be a good starting place.

We could also instrument some methods by default such as counters for readFromWire and writeToWire from ActorSystemUtils or Supervisor retries. I think @softinio should be able to specify what other methods are good candidates for some default instrumentation.