Implementing Light CSR kernel for segments.

src/TNL/Algorithms/Segments/CSR.h

src/TNL/Algorithms/Segments/CSRView.h

src/TNL/Algorithms/Segments/Kernels/CSRLightKernel.h

src/TNL/Algorithms/Segments/Kernels/CSRLightKernel.hpp

src/UnitTests/Matrices/CMakeLists.txt

src/UnitTests/Matrices/SparseMatrixTest_CSRLight.cpp

src/UnitTests/Matrices/SparseMatrixTest_CSRLight.cu

src/UnitTests/Matrices/SparseMatrixTest_CSRLight.h

...Tests/Matrices/SparseMatrixVectorProductTest_CSRLight.cpp

...tTests/Matrices/SparseMatrixVectorProductTest_CSRLight.cu

...itTests/Matrices/SparseMatrixVectorProductTest_CSRLight.h