engaged array strides support for opencl code generated kernels.

hysop/backend/device/autotunable_kernel.py

hysop/backend/device/codegen/base/variables.py

hysop/backend/device/codegen/kernels/directional_remesh.py

hysop/backend/device/kernel_autotuner.py

...p/backend/device/opencl/autotunable_kernels/remesh_dir.py

hysop/backend/device/opencl/opencl_array_backend.py

...ckend/device/opencl/operator/directional/advection_dir.py