WebGPU Renderer

[jonobr1]

Is your feature request related to a problem? Please describe.
It's nowhere near a release candidate (see caniuse), but having a WebGPU renderer seems like the natural evolution of renderers in Two.js.

Describe the solution you'd like
Be able to tap into WebGPU like so:

var two = new Two({ type: Two.Types.webgpu });

Additional context
Latest updates of w3c specification live here: https://www.w3.org/TR/webgpu/