Support C#7 value tuples

Add support for c# 7 value tuple. Example. Consider following action

        public (IEnumerable<string> Collection, string Token) TestAction()
        {
            return (new string[] { "value1", "value2" }, "TokenValue");
        }

expected definition:

 "definitions": {
    "ValueTuple[IEnumerable[String],String]": {
      "type": "object",
      "properties": {
        "Collection": {
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "Token": {
          "type": "string"
        }
      }
    }
  },

actual definition

 "definitions": {
    "ValueTuple[IEnumerable[String],String]": {
      "type": "object",
      "properties": {
        "item1": {
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "item2": {
          "type": "string"
        }
      }
    }
  },

[Soarc]

ValueTuples can be treated as simple objects with well known property names matching values defined in generated TupleElementNamesAttribute. The only problem i can see is generating definition name.

[Leonardo-Ferreira]

any news here? im kinda having a problem here also… It is worth noting that if you use List<KeyValuePair<string,string>> the output is field:[{key:string,value:string}], so why not have List<(string Name, string Email)> rendered as field:[{Name:string,Email:string}]