* add sampler type in DescriptorSetLayout
[**New Material Version**]
* select the proper descriptor set layout in the rendering loop
Now that the per-view layout can be different based on the type of
shadow, we need to make sure we set the proper layout in the pipeline
and use the corresponding descriptor set.
There are now 16 "per-view" layouts and their corresponding descriptor
set. There are two sets of 8, the current set is determined by the
shadow type on the view.
Then during rendering, when we set the pipeline we need to select the
corresponding layout; each material now offers both versions of the
layout and we just pick the right one.
DescriptorSet::setBuffer and setSampler now need the layout in order
to do some validation that the correct type of descriptor is used.
This will help catch problems earlier.
* DescriptorType now includes the "dimension" of the texture
DescriptorType now also encodes wether the descriptor expects a 2D, 3D,
Cubemap and/or Array.
This is needed by both Metal and WebGPU.
[**New Material Version**]
* Fix typos.
* fix fog sampler descriptor type
e7a8f471a1