feat: add CUDA raytracing benchmark and refactor VoxRaytracer::RayData to use DataAllocator for host/device memory management.

src/Vtk/CMakeLists.txt

@@ -19,6 +19,11 @@ set(LIBRARIES Eigen3::Eigen
               ${VTK_LIBRARIES}
               ${PACKAGE_LIBPREFIX}Math)
 
+if(USE_CUDA)
+  find_package(CUDAToolkit REQUIRED)
+  list(APPEND LIBRARIES CUDA::cudart)
+endif()
+
 set(libname ${PACKAGE_LIBPREFIX}Vtk)
 set(ULIB_SHARED_LIBRARIES ${ULIB_SHARED_LIBRARIES} ${libname} PARENT_SCOPE)
 set(ULIB_SELECTED_MODULES ${ULIB_SELECTED_MODULES} Vtk PARENT_SCOPE)