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nvk: implement conservative rasterization (all GPUs)

Arthur Huillet requested to merge ahuillet/mesa:conservative_raster_1 into main

Implement conservative rasterization

This is based on Benjamin's work in !25668 (closed), but with fixes.

Not testing on pre-Volta yet, but matches Benjamin's code except for minor fixes.

I've squashed Benjamin's original commit and my modifications, as suggested by Mary.

AD102 testing:

deqp-vk --deqp-case='*conservative*'
Test run totals:
  Passed:        250/11777 (2.1%)
  Failed:        0/11777 (0.0%)
  Not supported: 11527/11777 (97.9%)
  Warnings:      0/11777 (0.0%)
  Waived:        0/11777 (0.0%)
Edited by Arthur Huillet

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