wifi: add checkbox to disable Management Frame Protection (802.11w) in case of WPA3 encryption
[Management Frame Protection](https://openwrt.org/docs/guide-user/network/wifi/basic?s%5B%5D=ieee80211w#common_options1) is enabled by default for WPA3 on OpenWrt.
But in some cases it causes trouble with certain devices that fails to connect to WiFi Access Point - see https://forum.turris.cz/t/turris-omnia-wifi-health/15704/15
So I propose to add checkbox to WiFi page to optionally disable Management Frame Protection, if it causes trouble. Let it enabled by default, disable it if necessary.
Something along:
```
[ ] Disable Management Frame Protection
_In case you have trouble connecting to WiFi Access Point, try disabling Management Frame Protection [...]_
```
* It should be available only for WPA3 encryption modes - WPA3 & WPA2/3.
* In case of WPA2, keep it hidden.
Depends on: turris/foris-controller/foris-controller#239
issue