static Resilience4jCircuitBreakerFactory of() {
        return Resilience4jCircuitBreakerUtil.FACTORY;
    }
Returns the default {@link Resilience4jCircuitBreakerFactory}.
The host, method, and path will be concatenated with a '#'
and will be used as the name parameter of {@link CircuitBreakerRegistry#circuitBreaker(String)}.
resilience4j2/src/main/java/com/linecorp/armeria/resilience4j/circuitbreaker/Resilience4jCircuitBreakerFactory.java