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Add sphere tests (#402)

* Add simple sphere intersection test

There wasn't a way to enable spheres in OptiX pipelines, so add a new
flag named EnableSpheres to RayTracingPipelineFlags. When set, make
OptiX's sphere intersector available via the name
"__builtin_intersection__sphere" and enable spheres in the pipeline's
compile options.

* Add ray tracing sphere tests

The new tests check that we can intersect with sphere primitives, and
that both the plain and hit object sphere intrinsics return valid
results.

To use spheres, OptiX requires the application to set
OPTIX_PRIMITIVE_TYPE_FLAGS_SPHERE in its pipeline compile options and
link in the builtin sphere intersection module. To allow this, we add a
new flag named `EnableSpheres` to `RayTracingPipelineFlags`. This flag
instructs slang-rhi to set the necessary pipeline compile option and
make the builtin sphere intersection module available via the entry
point name `__builtin_intersection__sphere`.

* run commit hooks

* Update SLANG_RHI_FETCH_SLANG_VERSION

Update to version that includes fix for LSS intrinsic capabilities.

* fix file name for sphere test shaders

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