Draft: Add capability to detect yet unsupported Wi-Fi 7 wireless interfaces (#1095302 #1103993)

netcfg uses only legacy wireless extensions (wext) but Wi-Fi 7 devices support only nl80211 and are currently detected and used as wired devices.

This quick-and-dirty draft adds heuristics based on sysfs contents to detect if a network interface is a wireless interface when it does not support wext and makes it unusable until nl80211 support is added.

It adds non-translatable templates to inform the user when unsupported wireless interfaces are detected.