Add support for GLSL_EXT_ray_tracing

and SPV_KHR_ray_tracing

Test/spv.ext.ClosestHitShader_Errors.rchit

@@ -0,0 +1,12 @@
+#version 460
+#extension GL_EXT_ray_tracing : enable
+hitAttributeEXT vec4 payload;
+layout(binding = 0, set = 0) uniform accelerationStructureEXT accEXT;
+
+void main()
+{
+    payload.x = 1.0f;                                       // ERROR, cannot write to hitattributeEXT in stage
+    reportIntersectionEXT(1.0, 1U);                          // ERROR, unsupported builtin in stage 
+    terminateRayEXT();
+    ignoreIntersectionEXT();
+}