Add `vendor:wgpu`

[laytan]

I made these bindings and wrote the JS "proxy" a few weeks ago for a game I am making, even though webgpu is not "out" yet I think it is a valuable API for vendor and the API won't change much.

A quick sample is included that also shows how you'd build this for the web.

Links:

• https://github.com/webgpu-native/webgpu-headers
• https://github.com/gfx-rs/wgpu-native
• https://caniuse.com/webgpu