Pekko Typed Actor test

[pjfanning]

• There appear to be no existing tests for using Pekko or Akka typed actors
• I may be incorrect but in my limited testing the underlying "user" actor seems to be the best one to track for typed actors
• I have a test case in this PR but had to modify the runtime code to be able to track the "user" actor
• If someone has a better understanding of what is best to monitor, I would be interested in feedback

I added this debug logging to kamon but omitted it from this PR. When greet-service/user was ignored because it was treated as a supervisor, none of the other actors that are created for the greet-service seemed to any metrics (see the test in the PR to see what the greet-service is). By changing the logic so that greet-service/user can be tracked, now I get some metrics.

16:50:12.742 [pool-1-thread-1] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/] supervisor [true] tracked [false]
16:50:12.827 [pool-1-thread-1] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/user] supervisor [true] tracked [false]
16:50:12.833 [pool-1-thread-1] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system] supervisor [true] tracked [false]
16:50:12.849 [pool-1-thread-1] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system/log1-Slf4jLogger] supervisor [false] tracked [false]
16:50:12.853 [greet-service-pekko.actor.internal-dispatcher-4] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system/log1-Slf4jLogger] supervisor [false] tracked [false]
16:50:12.905 [pool-1-thread-1] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system/log2-TestLogger] supervisor [false] tracked [false]
16:50:12.906 [greet-service-pekko.actor.internal-dispatcher-4] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system/log2-TestLogger] supervisor [false] tracked [false]
16:50:12.910 [greet-service-pekko.actor.default-dispatcher-3] INFO  k.instrumentation.pekko.TestLogger - Slf4jLogger started
16:50:12.917 [pool-1-thread-1] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system/eventStreamUnsubscriber-1] supervisor [false] tracked [false]
16:50:12.917 [greet-service-pekko.actor.internal-dispatcher-4] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system/eventStreamUnsubscriber-1] supervisor [false] tracked [false]
16:50:12.964 [pool-1-thread-1] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system/Materializers] supervisor [false] tracked [false]
16:50:12.965 [greet-service-pekko.actor.internal-dispatcher-2] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system/Materializers] supervisor [false] tracked [false]
16:50:12.980 [greet-service-pekko.actor.internal-dispatcher-4] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system/Materializers/StreamSupervisor-0] supervisor [false] tracked [false]
16:50:13.005 [pool-1-thread-1] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system/localReceptionist] supervisor [false] tracked [false]
16:50:13.006 [greet-service-pekko.actor.internal-dispatcher-4] DEBUG k.i.p.instrumentations.ActorMonitor - Creating actor monitor for actor [greet-service/system/localReceptionist] supervisor [false] tracked [false]