Added Devices::Sequential and corresponding specializations in TNL::Algorithms

src/TNL/Algorithms/CudaReductionKernel.h

src/TNL/Algorithms/MemoryOperations.h

src/TNL/Algorithms/MemoryOperationsHost.hpp

src/TNL/Algorithms/MemoryOperationsSequential.hpp

src/TNL/Algorithms/Multireduction.h

src/TNL/Algorithms/Multireduction.hpp

src/TNL/Algorithms/ParallelFor.h

src/TNL/Algorithms/Reduction.h

src/TNL/Algorithms/Reduction.hpp

src/TNL/Algorithms/Scan.h

src/TNL/Algorithms/Scan.hpp

src/TNL/Allocators/Default.h

src/TNL/Containers/NDArray.h

src/TNL/Devices/Host.h

src/TNL/Devices/Sequential.h