Add support for GLSL_EXT_ray_tracing

and SPV_KHR_ray_tracing

Test/spv.ext.RayConstants.rgen

@@ -0,0 +1,15 @@
+#version 460
+#extension GL_EXT_ray_tracing : enable
+layout(binding = 0, set = 0) uniform accelerationStructureEXT accEXT;
+layout(location = 0) rayPayloadEXT vec4 payload;
+void main()
+{
+    const uint rayFlags = gl_RayFlagsNoneEXT | gl_RayFlagsOpaqueEXT |
+                          gl_RayFlagsNoOpaqueEXT | gl_RayFlagsTerminateOnFirstHitEXT |
+                          gl_RayFlagsSkipClosestHitShaderEXT | gl_RayFlagsCullBackFacingTrianglesEXT |
+                          gl_RayFlagsCullFrontFacingTrianglesEXT | gl_RayFlagsCullOpaqueEXT | 
+                          gl_RayFlagsCullNoOpaqueEXT;
+
+    const int payloadId = 1;
+    traceRayEXT(accEXT, rayFlags, 0, 1, 1, 0, vec3(0.0f), 0.5f, vec3(1.0f), 0.75f, payloadId);
+}