pipewire-control: add script

[redxtech]

I have written a simple implementation of pulseaudio-control that doesn't rely on any pulseaudio tools. I had a hard time finding a module that didn't rely on pactl or pamixer (which I couldn't use in my script), so I wrote my own. Hopefully others find it helpful.

Notes:

• This does depend on a few non-standard commands, such as rg (ripgrep), sd (sed alternative), and choose (awk alternative). If it would be preferred, I can rewrite it to use the standard set of tools from coreutils.
• I included the format settings used in the screenshot, but noted them as such. If this isn't wanted, I can of course remove it.

[x70b1]

Thanks for this PR!

I only see a limited use case here for other users. But if you want to setup an own repository for this project, I would add it to the repo list on the main README.md.