WebGL support

[cztomsik]

Ideally, it should be then possible to run various other libs like pixi.js, three.js or even react-three-fiber.

https://github.com/pixijs/pixi.js
https://github.com/react-spring/react-three-fiber

I think we could simply run some codesandbox examples (as they are already transpiled)

There's already one webgl implementation from @raub
https://github.com/node-3d/webgl-raub

And there's a lot of work done already (and it probably works with modified three.js already) and maybe it could be reused even without any changes to the native part of graffiti.

I'd love to keep it as optional module, but graffiti (js part) could detect presence and "install/inject" it into its own subset of DOM api