Fix building acceleration structures from static scenes

include/vkcv/Core.hpp

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

modules/scene/src/vkcv/scene/MeshPart.cpp

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

projects/rt_ambient_occlusion/src/main.cpp

src/vkcv/AccelerationStructureManager.cpp

src/vkcv/AccelerationStructureManager.hpp

src/vkcv/Core.cpp