WiFi - add missing scan result getter implementations (BSSID, channel) and the ScanNetworksAdvanced example#815

facchinm merged 2 commits intoarduino:mainarduino/ArduinoCore-mbed:mainfrom

JAndrassy:wifi_scan_getters_fixJAndrassy/ArduinoCore-mbed:wifi_scan_getters_fixCopy head branch name to clipboard