Support for Circuit Breakers like Hystrix and Resilience4J

[kdavisk6]

Feign currently supports Hystrix only. This support is widely used and mature and I would like to see it added to FeignX.

When doing so, we should consider creating a general abstraction for these types of extensions so users can choose between any Circuit Breaker implementation. At a minimum, we should consider not only Hystrix, but also Resilience4J, due to Hystrix's current status.