Implements list of available operations

Example response

{
  "value": [
    {
      "properties": {
        "serviceSpecification": {
          "metricSpecifications": [
            {
              "displayDescription": "Average disk throughput due to read operations over the sample period.",
              "displayName": "Disk Read Bytes/Sec",
              "name": "DiskReadBytesPerSecond",
              "unit": "BytePerSecond"
            }
          ]
        }
      }
    }
  ]
}