Actor Pooling

[Firstyear]

Hey there,

This library looks really cool, thanks! I was wondering if you had some plans to add something like Actix's SyncArbiter. Xactor runs on tokio or other async run times that can be multithreaded, so it can be useful to have "replicas" of Actors to allow concurrent processing of tasks. Is this something you'd consider adding?
An example is a web or database server that wants to have as many worker actors as threads on the system, but they are all replicas of the same Actor instance which poll for messages from a single queue.

Thanks!