Playing Videofiles

### What is the problem or limitation you are having?

Hello,

is it possible to play video files in toga?

### Describe the solution you'd like

I want to play a Video file in my Toga-App.

### Describe alternatives you've considered

-

### Additional context

_No response_

No files, tests, platforms, or entry points are named in the issue. Start by reviewing Toga's existing widget and media capabilities across its supported native backends, then define the platform scope and expected playback behavior before implementation. Done means a documented, tested way to play video files in a Toga app.

Written by the indexing model from the issue text.