multi-feign

each feign client has a separate httpclient/okhttp

usage guide

1. create an interface, then annotated with @MultiFeignClient
2. register client, and specify the bean name in @MultiFeignClient
   2.1 register a customized okhttp client(if you use ClientPoolTypeEnum.OK_HTTP in @MultiFeignClient) in Spring
   2.2 register a customized http client(if you use ClientPoolTypeEnum.HTTP_CLIENT in @MultiFeignClient) in Spring
3. using @RequestLine to annotate method