[#66] Added concept of command stream and started layout transition rework

config/Sources.cmake

include/vkcv/CommandRecordingFunctionTypes.hpp

include/vkcv/CommandStreamManager.hpp

include/vkcv/Core.hpp

include/vkcv/Handles.hpp

include/vkcv/Image.hpp

include/vkcv/PassConfig.hpp

include/vkcv/SwapChain.hpp

projects/cmd_sync_test/src/main.cpp

projects/first_mesh/src/main.cpp

projects/first_triangle/src/main.cpp

src/vkcv/BufferManager.cpp

src/vkcv/CommandStreamManager.cpp

src/vkcv/Core.cpp

src/vkcv/Image.cpp

src/vkcv/ImageLayoutTransitions.cpp

src/vkcv/ImageLayoutTransitions.hpp

src/vkcv/ImageManager.cpp

src/vkcv/ImageManager.hpp

src/vkcv/PassConfig.cpp