Test barycentric coordinates in ray tracing hits

Test barycentric coordinates in ray tracing hits

Add some tests to check the reported barycentric coordinates both in hit
attributes when ray tracing and also in ray queries have the expected
values and correspond to factors b and c in the barycentric coordinates
equation:

  p = a pa + b pb + c pc

New tests:
dEQP-VK.ray_tracing_pipeline.barycentric_coordinates.*
dEQP-VK.ray_query.barycentric_coordinates.*

Components: Vulkan
VK-GL-CTS issue: 2812

Change-Id: I1beba46045ea4efdfe7dab2318c331c4046d2d1d