Introduce hedging

[roma-glushko]

Sometimes it's reasonable to dispatch a few requests at the same time to organize a race between them for the sake of improving latency (while having some resiliency added). This is call hedging.

Usecases:

• You have several LLM providers and you want to get the next agent "move" as soon as possible to meet real-time latency requirements

Reference:

• https://github.com/resilience4j/resilience4j/tree/master/resilience4j-hedge