Implemented ChunkedEllpackSegment - for CPU only.

src/Benchmarks/scripts/tnl-spmv-benchmark-make-tables.py

src/TNL/Containers/Segments/CSRView.hpp

src/TNL/Containers/Segments/ChunkedEllpack.h

src/TNL/Containers/Segments/ChunkedEllpack.hpp

src/TNL/Containers/Segments/ChunkedEllpackSegmentView.h

src/TNL/Containers/Segments/ChunkedEllpackView.h

src/TNL/Containers/Segments/ChunkedEllpackView.hpp

src/TNL/Matrices/SparseMatrix.h

src/TNL/Matrices/SparseMatrix.hpp

src/UnitTests/Matrices/CMakeLists.txt

src/UnitTests/Matrices/SparseMatrixTest.h

src/UnitTests/Matrices/SparseMatrixTest.hpp

src/UnitTests/Matrices/SparseMatrixTest_ChunkedEllpack.h

src/UnitTests/Matrices/SparseMatrixTest_SlicedEllpack.h