Improve layering in the solari BRDF#24243
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Objective
Improve the solari BRDF. Split off from #23818.
Solution
The layering approach used in the current brdf to distribute energy between the specular and diffuse lobes doesn't work, for reasons I honestly don't quite understand.
The suggested changes are roughly inspired by OpenPBR's equation 42. We're not using EON though, so this uses Filament's multiscattering correction instead of equation 39.
This formulation has the downside of breaking reciprocity. As far as I can tell the path tracer is unidirectional, so this shouldn't cause issues.
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PICA PICA pathtraced
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