Cycles: Add support for parallel compilation of OptiX module

OptiX 7.4 adds support for splitting the costly creation of an OptiX
module into smaller tasks that can be executed in parallel on a
thread pool.
This is only really relevant for the "shader_raytrace" kernel variant
as the main one is small and compiles fast either way. It sheds of
a few seconds there (total gain is not massive currently, since it is
difficult for the compiler to split up the huge shading entry point
that is the primary one taking up time, but it is still measurable).

Differential Revision: https://developer.blender.org/D14845

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