ISelfSupervise

[rogeralsing]

Related to https://github.com/asynkron/protoactor-dotnet/issues/1041

Should we allow actors to supervise themselves?

Just as we can escalate exceptions to a parent. we could allow the actor to supervise themselves.

e.g.

public class SomeActor : IActor, ISelfSupervise 
{
      public Task Receive(...);

     void HandleFailure(RestartStatistics rs, Exception cause, object? message, other stuff...) {
          
     }
}