Spring Cloud Openfeign RequestInterceptor should support sort by order

Is your feature request related to a problem? Please describe. Some scenes need RequestInterceptor to support sort by order. Describe the solution you'd like

        Map<String, RequestInterceptor> requestInterceptors = context
                .getInstances(this.contextId, RequestInterceptor.class);
        if (requestInterceptors != null) {
            builder.requestInterceptors(requestInterceptors.values());
        }

shold replace to

        Map<String, RequestInterceptor> requestInterceptors = context
                .getInstances(this.contextId, RequestInterceptor.class);
        if (requestInterceptors != null) {
                         List<RequestInterceptor> interceptors = new ArrayList<>(requestInterceptors.values());
                         AnnotationAwareOrderComparator.sort(interceptors);
            builder.requestInterceptors(interceptors);
        }

Comment From: OlgaMaciaszek

Closed with gh-419.