WGPU using child windows

[vyeevani]

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This is a minor change from the code perspective to allow child windows to be created and some fixes for using the transparency feature. However, the implications of this are pretty staggering as they allow for the use of other rendering toolboxes.

Tested on macOS.

[vyeevani]

Slightly more interesting example of how this could play out: https://github.com/vyeevani/dioxus_native_graphics

[vyeevani]

https://github.com/user-attachments/assets/082ef776-dad2-4872-8e1c-b230574ec234

[jkelleyrtp]

I struggled to get merge conflicts fixed for this PR since the github CLI was checking out the wrong branch. I ended up fixing things in #3257 and adding you as a co-author so you get commit credits :)

Thanks for the PR!

[vyeevani]

Awesome! Sorry I hadn't been very active on this, got pulled into some other stuff. thank you for seeing it through :)