Support for KHR_lights_punctual extension

[mvaligursky]

• Added support for KHR_lights_punctual extension https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_lights_punctual
• Note of the limitation: Implement support for physically based light intensity units #3252 causing light intensities to be clamped to 0..1 range
• Note that lights are supported only when creating hierarchy with render components using instantiateRenderEntity, but not when using model components using instantiateModelEntity
• The instance of the model is no longer created when a glb file is loaded, and is created and cached on the fly only when needed
• render component hierarchy is being created from parsed glb file directly with no dependency on the Model being created (and so if user uses Renders, the Model does not get created at all)
• moved SkinInstanceCache to separate file to share it between render component and glb creating one.
• moved GlbParser.CreateModel to ContainerResource.

Fixes #2061

Example on how to create lights from loaded glb container (the same as creating hierarchy with renders):
const lightsEntity = assets.lights.resource.instantiateRenderEntity();

lights can be processed this way:

const lights = lightsEntity.findComponents("light");
lights.forEach((light) => {
    light.enabled = false;
});

Thanks to @godiagonal for initial implementation here: #2385