Add dequantize() function

[donmccurdy]

Adds dequantize() function, removing KHR_mesh_quantization and converting vertex attributes to float32.

Usage:

import { dequantize } from '@gltf-transform/functions';
await document.transform(dequantize());

gltf-transform dequantize input.glb output.glb

Remaining:

• Unit tests