Resolve single-cell location

[coderbyheart]

Currently only the GROUNDFIX messages are resolved by nRF Cloud, however single-cell location (based on the information in the DEVICE message) should also be shown.

This needs a REST call to the nRF Cloud API to resolve. Implement simple caching, as in nRF Asset Tracker.

{
  "appId": "DEVICE",
  "messageType": "DATA",
  "ts": 1690367239886,
  "data": {
    "networkInfo": {
      "currentBand": 20,
      "networkMode": "LTE-M",
      "rsrp": -102,
      "areaCode": 2305,
      "mccmnc": 24202,
      "cellID": 34237196,
      "ipAddress": "100.74.127.55",
      "eest": 7
    }
  }
}