Minimize shortcut - a milestone feature

### Description of the new feature / enhancement

Concise and to the point. Minimization is achieved via keyboard shortcuts, and it works without many bugs. Although it's very simple, no one seems to have done it, or has done it poorly. Many thanks.

### Scenario when this would be used?

This feature is useful for anyone looking to save time, as minimizing is a very frequent operation. Because of this frequent use, using a keyboard shortcut can save most people a significant amount of time, resulting in a substantial increase in efficiency!

### Supporting information

_No response_

The issue names no files, entry points, or tests. Start by identifying which PowerToys utility should own a global minimize shortcut and how existing keyboard shortcuts are registered. Done means the shortcut, target window behavior, conflict handling, and validation approach are clearly defined.

Written by the indexing model from the issue text.