Power Volume

### Description of the new feature / enhancement

Since Power Display helps manage displays without having to go into the system settings to configure them, I'd like something like that, but for volume - something like EarTrumpet, but in PowerToys.

I know someone else asked about something like this, but that was almost 6 years ago, and it hasn't been implemented yet.

What else would be nice is if I could have different media playing from my browser, and this could track all of it.
Something else that would be nice is a media control one too, whether it be part of Power Volume or a separate Power Media.

### Scenario when this would be used?

I'd use it daily, managing the volume of several apps, without having to find and open the sound mixer.

### Supporting information

EarTrumpet

No implementation files, tests, or entry points are identified in the issue. First review how existing PowerToys utilities are structured, then define the scope for per-application volume control, browser media tracking, and any separate media controls; the work is done when the agreed feature set is implemented and usable without opening the system sound mixer.

Written by the indexing model from the issue text.