Add initial gpu utility code

SDK/CPP/private/frame_impl.cpp

SDK/CPP/private/frame_impl.hpp

SDK/CPP/public/CMakeLists.txt

SDK/CPP/public/include/voltu/cuda.hpp

SDK/CPP/public/include/voltu/opencv.hpp

SDK/CPP/public/include/voltu/system.hpp

SDK/CPP/public/include/voltu/types/frame.hpp

SDK/CPP/public/samples/basic_file/main.cpp

SDK/CPP/public/samples/basic_virtual_cam/main.cpp

SDK/CPP/public/samples/fusion_evaluator/main.cpp

SDK/CPP/public/voltu.cpp

SDK/CPP/public/voltu_cv.cpp