Add in API for programmatically reconciling Aeron counters with Artio

[RichardWarburton]

You can currently reconcile them by using the printAeronStreamIdentifiers() option, but this isn't very useful for people ingesting stuff into a monitoring system like prometheus.

One option might be to expose the API programmatically like:

AtomicCounter msgSeqNo = FixCounterView.sentMsgSeqNo(sessionId).  - FixCounterView.bytesInBuffer(sessionId);

Another would be to see if we can put more information into the description that would be use-able in a monitoring tool.

A third option might be to have a callback when the Publication/Subscription is created - passing the Artio usage name of the Publication / Subscription to application code.