Sandbox - generated glb size much bigger than the original one

[kzhsw]

Also this if 16bit indices or KHR_mesh_quantization used in your model:

Keep index and KHR_mesh_quantization attributes on GLB export

OS: Windows 10 x64 Browser: ungoogled-chromium 108.0.5359.95 Babylon.js: 5.38.0 Playground: Babylon.js Playground Expected: Exported GLB should contains the original index and attribute buffer. Actual: index changed on export, expected: Uint16Array actual: Uint32Array index byteLength changed on export, expected: 6 actual: 12 position type changed on export, expected: 5123 actual: 5126 position size changed on export, expected: 6 actual: 12