Improve support for arrays in body

[mzielinski]

Assume that we have below response from server

{
   "exp": 2459982033,
   "user_name": "admin",
   "authorities": [
       "ROLE_ADMIN"
   ],
   "client_id": "ui",
   "scope": [
       "read",
       "write"
   ]
}

I would like to check wheather scope array is not empty. I do not care about specific values. Currently I am not able to do it. For sure we should improve support for arrays in body, maybe this task will be a good place to think about it.

[marcingrzejszczak]

Right now you can do it with a method on the server side.

[marcingrzejszczak]

This issue was moved to spring-cloud/spring-cloud-contract#24