Add support for optix instance index - #208
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This PR exposes the OptiX "instance_idx" field to DrJit. This was previously not exposed in the OptiX ray tracing routines.
The motivation to add this is to enable the implementation of a "batched" instancing plugin in Mitsuba 3. This would allow a single instance shape plugin to represent a collection of instances, which dramatically reduces JIT compilation cost for scenes with high instance counts.