Add ray traced glTF sample (#1083)

* Started working on a ray tracing glTF sample

* Started working on a ray tracing glTF sample

Added textures using descriptor indexing

* Frame accumulation

Pass glTF node transforms to BLAS build

* Shader cleanup

* Code cleanup, flip Y using TLAS transform matrix

* Create AS for all primitives in the gltf scene

* Remove unused variables

* Added missing shaders

* Minor cleanup

shaders/glsl/raytracinggltf/miss.rmiss

@@ -0,0 +1,15 @@
+/* Copyright (c) 2023, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+#version 460
+#extension GL_EXT_ray_tracing : enable
+
+layout(location = 0) rayPayloadInEXT vec3 hitValue;
+
+void main()
+{
+    hitValue = vec3(1.0);
+}