Add support for WiFi location

[coderbyheart]

nRF Cloud has support for WiFi location, add support for this. The implementation will most likely be similar to multi-cell location support.

• create new message format (compare ncellmeas message for neighboring cells)
  • Add support for WiFi site surveys #605
• Firmware support
  • implement it in asset_tracker_v2
  • Report can be just the MACs: https://github.com/NordicSemiconductor/nrfcloud-location-services-tests-js/pull/124/files
• implement WiFi location resolution in cloud (compare nRF Cloud Neighbor Cell Geolocation in nRF Asset Tracker for AWS and for Azure.
  • Resolve WiFi site surveys asset-tracker-cloud-aws-js#1184
  • Add support for WiFi location asset-tracker-cloud-azure-js#559
• Implement showing WiFi location in the web application
  • Show Wi-Fi location asset-tracker-cloud-app-aws-js#402
  • Show Wi-Fi location asset-tracker-cloud-app-js#560
• Add tests for WiFi location services nrfcloud-location-services-tests-js#114
• see also nRF Cloud SCELL / MCELL has been renamed to Ground Fix services (WiFi has been added) #598

Example report

{
"ts":   1670591331896,
"v":    [{
"mac":  "40:01:7a:c9:10:22",
"ssid": "TnGroup",
"rssi": -65,
"chan": 1
}, {
"mac":  "80:e0:1d:2a:92:f2",
"ssid": "TnGroup",
"rssi": -70,
"chan": 1
}, {
"mac":  "40:01:7a:c9:10:21",
"ssid": "Telenor_Guest",
"rssi": -65,
"chan": 1
}, {
"mac":  "40:01:7a:c9:10:27",
"ssid": "TnNorgeMacOS",
"rssi": -65,
"chan": 1
}, {
"mac":  "80:e0:1d:2a:92:f1",
"ssid": "Telenor_Guest",
"rssi": -69,
"chan": 1
}, {
"mac":  "80:e0:1d:2a:92:f5",
"ssid": "TnNorge",
"rssi": -69,
"chan": 1
}, {
"mac":  "96:15:44:ac:6c:87",
"ssid": "Geotek",
"rssi": -71,
"chan": 1
}, {
"mac":  "7c:10:c9:02:b8:68",
"ssid": "PTU_TEST",
"rssi": -64,
"chan": 8
}, {
"mac":  "9a:15:44:ac:6c:6e",
"ssid": "Pets",
"rssi": -68,
"chan": 11
}, {
"mac":  "4c:e1:75:bf:e2:a0",
"ssid": "NORDIC-GUEST",
"rssi": -41,
"chan": 11
}, {
"mac":  "4c:e1:75:bf:e2:a1",
"ssid": "NORDIC-INTERNAL",
"rssi": -41,
"chan": 11
}, {
"mac":  "82:15:44:ac:6b:1f",
"ssid": "Geogjest",
"rssi": -75,
"chan": 11
}, {
"mac":  "82:15:54:ac:6c:6e",
"ssid": "Geogjest",
"rssi": -85,
"chan": 36
}, {
"mac":  "86:15:54:ac:6c:6e",
"ssid": "Geoprosjekt",
"rssi": -85,
"chan": 36
}, {
"mac":  "9a:15:54:ac:6c:6e",
"ssid": "Pets",
"rssi": -85,
"chan": 36
}, {
"mac":  "9e:15:54:ac:6c:6e",
"ssid": "Geoccast",
"rssi": -85,
"chan": 36
}, {
"mac":  "96:15:54:ac:6c:6e",
"ssid": "Geotek",
"rssi": -85,
"chan": 36
}, {
"mac":  "b6:15:54:ac:6c:6e",
"rssi": -85,
"chan": 36
}, {
"mac":  "7c:10:c9:02:b8:6c",
"ssid": "PTU_TEST_5G",
"rssi": -62,
"chan": 36
}, {
"mac":  "80:e0:1d:2a:92:fd",
"ssid": "TnGroup",
"rssi": -84,
"chan": 36
}, {
"mac":  "80:e0:1d:2a:92:f9",
"ssid": "Telenor_Linx",
"rssi": -84,
"chan": 36
}, {
"mac":  "80:e0:1d:2a:92:f8",
"ssid": "TnNorgeMacOS",
"rssi": -84,
"chan": 36
}, {
"mac":  "8a:15:54:ac:6c:6e",
"ssid": "Geoikt",
"rssi": -86,
"chan": 36
}, {
"mac":  "fe:cb:ac:8f:77:3f",
"ssid": "Geotek",
"rssi": -85,
"chan": 48
}, {
"mac":  "80:e0:1d:02:2e:2d",
"ssid": "TnGroup",
"rssi": -83,
"chan": 48
}, {
"mac":  "80:e0:1d:02:2e:2e",
"ssid": "Telenor_Guest",
"rssi": -84,
"chan": 48
}, {
"mac":  "f6:cb:ac:8f:77:3f",
"ssid": "Geoccast",
"rssi": -84,
"chan": 48
}, {
"mac":  "4c:e1:75:bf:09:2f",
"ssid": "NORDIC-GUEST",
"rssi": -68,
"chan": 116
}, {
"mac":  "4c:e1:75:bf:e2:af",
"ssid": "NORDIC-GUEST",
"rssi": -46,
"chan": 132
}, {
"mac":  "4c:e1:75:bf:e2:ae",
"ssid": "NORDIC-INTERNAL",
"rssi": -46,
"chan": 132
}]
}