Integration between the Resizer struct and bastion-executor

[Relrin]

Is your feature request related to a problem? Please describe.
Auto-scaling up/down actor groups based on the incoming traffic. And the perfect place for a getting a better scalability and performance cases could be the bastion executor.

Describe the solution you'd like
An existing solution (on which I'm currently working on) based on adding a Resizer instance to the Children. So it could time-to-time make checks and scalin up/down based on the aggregated statistics from actors.

This solution based on the new approach where resizers could be a part of back-pressure cases. And when back-pressure cases happen, resizer could try create a new actor and rebalance incoming data/packet/request to this actor instead. But in the case if it can't do it (due reaching the limits), we could just rollback to the default back-pressure logic.

But the single nuance here is to how to store parent / child id as the part of the context, so the resizer could call or pass a message to the certain node.

Describe alternatives you've considered
N/A