Add support for calculated metrics in report.queue for Data Warehouse

It would be amazing if I could request calculated metrics in a report.queue API request to DataWarehouse, as in:

{

   "reportDescription":

   {

      "reportSuiteID": "some_suite_id",

      "dateFrom": "2017-11-01",

      "dateTo": "2017-11-01",

      "metrics":

      [

         {"id": "cmSome_CalculatedMetric_ID"}

      ],

      "elements":

      [

         {"id": "some_prop"}

      ],

      "source": "warehouse"

   }

}