anv: Initial ray-tracing support

This MR includes :

• !13955 (closed)
• !16964 (merged)
• !16905 (merged)
• !15743 (merged)

$ ./deqp-vk -n dEQP-VK.ray_tracing_pipeline.*

Test run totals:
  Passed:        5203/9539 (54.5%)
  Failed:        0/9539 (0.0%)
  Not supported: 4336/9539 (45.5%)
  Warnings:      0/9539 (0.0%)
  Waived:        0/9539 (0.0%)