[iOS] Check/request for local network permission

[igorsantos07]

Feature request

This is basically a second try on #426, closed for staleness / lack of interest.
Since around 2020, it's possible to request local network permissions, as described in this support page.

Methods similar to Bluetooth and other simpler permissions should be included, so we can check that permission from the Cordova side as well.

One use-case for us is to check when the user accidentally refused the permission when we're trying to talk to LAN-based thermal printers, and warn them about steps to get it fixed.

I also wonder if it would ever be possible to have generic methods for that (so there wouldn't be much need to implement whole new methods for each new permission type create), as we (mostly?) do for Android - but I guess it's different because the iOS API needs the separate modules?

Thanks!