Actor lifetime

Unlike Actor implementation on other platforms, such as Akka.net (https://petabridge.com/bootcamp/), Service Fabric Actors are virtual. What this means is that the Service Fabric Reliable Actors runtime manages the location and activation of Actor instances. The Reliable Actors runtime automatically activates an Actor the first time it receives a request for that Actor ID. If an Actor instance remains unused for a period of time, the Reliable Actors runtime garbage-collects the in-memory object. The Reliable Actors runtime also maintains knowledge of the Actor's existence in the state manager for any future Actor reactivations. Actor instances are activated only when the runtime receives a message that is intended to be served by the Actor. If a message is sent to the Actor instance and there is no activation of that Actor on any cluster node, then the runtime...