Examples: Add galaxy

[brunosimon]

Description

A simple animated WebGPU galaxy based on Three.js Journey lessons.
The first of a dozen of TSL examples.

[Mugen87]

If you plan to add more examples like that, maybe we can all name them like webgpu_tsl_*. In this case: webgpu_tsl_galaxy.

[brunosimon]

Looks like the generated screenshot doesn't match.
I just run npm run make-screenshot webgpu_tsl_galaxy and then commit.
Tested from windows and MacOS.
Am I doing something wrong?

[Mugen87]

If you have the option, generate the screenshot from a Windows device (because the CI uses Windows as well). Besides, make sure you have latest build files on your local system. They are not built automatically when generating a screenshot so make sure to run npm run build before npm run make-screenshot.

[brunosimon]

All good 👍
I'll start working on the other TSL examples.

[sunag]

Bruno did some changes because WebGPU/WGSL pow() with negative values ​​was not working on Windows, but it works on MacOS. /cc @mrdoob