Add sponza as example scene for ray tracing

modules/scene/include/vkcv/scene/Mesh.hpp

modules/scene/include/vkcv/scene/Node.hpp

modules/scene/include/vkcv/scene/Scene.hpp

modules/scene/src/vkcv/scene/Mesh.cpp

modules/scene/src/vkcv/scene/Node.cpp

modules/scene/src/vkcv/scene/Scene.cpp

projects/rt_ambient_occlusion/CMakeLists.txt

projects/rt_ambient_occlusion/resources/Sponza/Sponza.bin

projects/rt_ambient_occlusion/resources/Sponza/Sponza.gltf

...mbient_occlusion/resources/shaders/ambientOcclusion.rchit

...ambient_occlusion/resources/shaders/ambientOcclusion.rgen

...mbient_occlusion/resources/shaders/ambientOcclusion.rmiss

projects/rt_ambient_occlusion/src/main.cpp

src/vkcv/AccelerationStructureManager.cpp