Improve Wired (Ethernet) Support

[amaanq]

Is your feature request related to a problem? Please describe.

Currently, a problem I'm facing is that the Ethernet support is missing a few basic features:

• There's no way to disconnect and connect an Ethernet device, KDE's networks tray menu allows you to do this, and I can do this with nmcli, but that's sort of annoying
• There's no support for multiple Ethernet devices - my current motherboard only has 1 port but my old one used to have 2, so this isn't something I can test/verify easily now, but looking at the code, it seems like there's no handling at all for multiple Ethernet devices.

I suspect this might be due to lacking support in Astal, but I figured it might be nice to track here, and so that other users can discover it more easily.

Describe the solution you'd like

Support for multiple Ethernet devices and connecting/disconnecting them at will.

Describe alternatives you've considered

Additional context

This likely needs upstream support first.