[FEAT] Report on microphone status

[proffalken]

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

I use this app to trigger various automation based on camera state already such as turning on my Keylight when the camera goes live.

I'd love to be able to do the same based on my microphone state, such as showing a big red light above my monitor when the mic is live during a zoom/teams call.

Describe the solution you'd like
Monitor the mic state in the same way that we monitor whether the camera is active or not.

Describe alternatives you've considered
N/A

Additional context

Using the current code for the camera sensor, I get the following output:

# fuser /dev/snd/by-id/usb-Focusrite_Scarlett_Solo_USB_Y7WH2WY0430F10-00
/dev/snd/controlC1:   4768

but that value doesn't seem to change based on whether the mic is active/muted in Zoom, so I'm not sure how else to track this information.