Renaming OffsetsHolder to OffsetsContainer.

src/TNL/Algorithms/Segments/BiEllpack.h

src/TNL/Algorithms/Segments/CSR.h

src/TNL/Algorithms/Segments/CSR.hpp

src/TNL/Algorithms/Segments/ChunkedEllpack.h

src/TNL/Algorithms/Segments/Ellpack.h

src/TNL/Algorithms/Segments/EllpackView.h

src/TNL/Algorithms/Segments/SlicedEllpack.h

src/TNL/Algorithms/Segments/detail/BiEllpack.h

src/TNL/Algorithms/Segments/detail/ChunkedEllpack.h