Include Monitor Name in asset details queried from API

Include SNMP monitor name in asset details when queried via API.

Current output for a SNMP monitor is:

    {
      "value": "652514484",
      "status": "ok",
      "monitor_id": 195774
    },

This level of detail doesn’t indicate what this particular monitor is for, other than “monitor_id”, which has no reference elsewhere in the API.