Use phone as a microphone

• I have checked that a similar feature request does not already exist.

I use my phone as a mic for my desktop by setting --audio-source=mic and then using Pipewire to connect it to a virtual source. It would be a lot easier to have some flag that does this automatically since it also plays whatever the mic picks up. Using --no-audio-playback doesn't work because I also disable video, so I also have to use Pipewire to disable the mic audio from being played.