GreasedLine webGPU support

[roland]

@Evgeni_Popov

and it does work for me, I don’t have any jittering, the PG behaves in WebGPU as in WebGL

Maybe it’s a MacOS issue? I’ll test it on a Windows device.

Meanwhile check out the screen capture from my Mac:
https://babylonjs.xyz/grl-jittering.mkv

thanks!