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nvk: implement VK_EXT_conservative_rasterization

Benjamin Lee requested to merge benjaminl/mesa:nvk/conservative-rasterization into main

What does this MR do and why?

Implement the VK_EXT_conservative_rasterization extension in NVK.

Closes #9627 (closed), and is needed for FL12_1 on vkd3d-proton (#9479)

CTS results for dEQP-VK.rasterization.conservative.* on a MAXWELL_B card:

Test run totals:
  Passed:        100/343 (29.2%)
  Failed:        0/343 (0.0%)
  Not supported: 243/343 (70.8%)
  Warnings:      0/343 (0.0%)
  Waived:        0/343 (0.0%)

I don't have anything newer to test on, and am particularly unsure if this works on Turing+.

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