support for multiple status code entries in custom values generating multiple tests

[noahdietz]

When supplying custom values for a specific path > operation > status code, supplying an array of objects for the status rather than just a single one could generate multiple unit tests within the operation level test block.

an example custom values blob would be as follows:

...
"200": [
       {
        "header": {
          "header-test": "a"
        },
        "query": {
          "status": [
            "notanenum3"
          ]
        },
        "response": [
          {
            "name": "sparky",
            "photoUrls": [
              "url1",
              "url2",
              "url3"
            ]
          },
          {
            "name": "champ",
            "photoUrls": [
              "url4",
              "url5",
              "url6"
            ]
          }
        ]
      },
      {
        "header": {
          "header-test": "b"
        },
        "query": {
          "status": [
            "otherstatus"
          ]
        },
        "response": [
          {
            "name": "fido",
            "photoUrls": [
              "url789"
            ]
          }
        ]
      }
],
...

Resulting in two tests (it clauses) being generated under the same operation-level block for the same status code, but with different request/response payloads.