Add C-API function UsmNDArray_MakeFromMemory and UsmNDArray_SetWritableFlag

[oleksandr-pavlyk]

This issue is to implement dpctl.tensor C-API function

cdef api object UsmNDArray_MakeFromMemory(int nd, Py_ssize_t *shape, int typenum, _Memory mobj, Py_ssize_t offset)

to create a usm_ndarray from given memory object and offset.

Also to implement

cdef api void UsmNDArray_SetWritableFlag(usm_ndarray arr, int flag)

See IntelPython/numba-dpex#890 (comment) for context.