Tracker: v9 glTF support

[felixpalmer]

Task list for GLTF support in v9

also see #702

v9.0

• Initial implementation feat(gltf): new module for glTF support #1819
• Release gltf package on npm

v9.1

• Remove gltf loaders.gl/math dependency once GLTF: inline emod function to remove loaders.gl/math dependency loaders.gl#2808 deployed
• Update website/package.json with gltf dependency
• More tests
• Remove GLTF attribute name mapping in GPUGeometry
• Upgrade guide mention GLTF
• Support IBL (if we postpone, we must document as limitation in luma v9 release notes)
• gltf bounding box courtesy method
• Extract gltf-instantiator to function

[chrisgervang]

Fantastic work bringing gltf into v9 @felixpalmer !
@ibgreen made a passing comment that imageBasedLightingEnvironment might not be used by deck and may not have been ported as a result. Deck has a prop for it that I've used successfully in the past. While not critical, I wanted to call it out in case you weren't aware.

[ibgreen]

We used to have a showcase example for gltf (currently in examples-wip folder) that did create IBL lighting. @felixpalmer create a new simpler glTF tutorial example

I didn't confirm that IBL didn't work but it required cube textures and I think those are broken right now.

[felixpalmer]

@chrisgervang @ibgreen I've added a task to the list above to include IBL. I have it as lower priority as my primary objective is getting something rendering in deck so we can port the layers that depend on GLTF

[ibgreen]

Makes sense, I suggest we save our effort and fix this after the texture refactor in #1860 lands.