Adds support for per request timeout options. Fixes #562

[meifans]

Adds support for per request timeout options
Fixes #562

Change:

• Add Options UT
• Ignore Options when set bodyIndex

As @kdavisk6 said

interface MyClient {
   @RequestLine("GET /data")
   public MyResponse getMyData(Request.Options options);
}

In Spring Cloud

interface MyClient {
   @RequestMapping(path = "/data")
   public MyResponse getMyData(Request.Options options);
}

[kdavisk6]

@meifans

Thank you for taking the time to make this change and for working with us. Approved.

[kdavisk6]

@meifans

I've approved this PR and marked it "ready to merge" This indicated to any other contributors that, without any additional feedback, we will merge this request in a few days.

[eugeniyk]

Hey @kdavisk6, I think it's quite important feature to be reflected in the docs! WDYT?

Also is my understanding correct - there's no way to specify default timeouts per RequestLine?

In my vision client settings hierarchy should be like that

1. request-level settings (has)
2. endpoint-level settings (doesn't have, and that's were I struggle)
3. client-instance-level settings (has)
4. default client in current jvm settings (doesn't have, (3) is enough)
5. defaults from feign repo (has)