Add vk_ray_trace_indirect_scissor sample

ray_tracing_indirect_scissor/shaders/lanternShadow.rmiss

@@ -0,0 +1,12 @@
+#version 460
+#extension GL_EXT_ray_tracing : require
+
+// Miss shader invoked when tracing shadow rays (rays towards lantern)
+// in lantern passes. Misses shouldn't really happen, but if they do,
+// report we did not hit any lantern by setting hitLanternInstance = -1.
+layout(location = 2) rayPayloadInEXT int hitLanternInstance;
+
+void main()
+{
+  hitLanternInstance = -1;
+}