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Add dlpack support for dpnp #1291

Description

@oleksandr-pavlyk

dpnp_array must have __dlpack__(self, stream=None), __dlpack_device__(self) methods and provide dpnp.from_dlpack(obj) function.

def __dlpack__(self, stream=None):
   return self._array_obj.__dlpack__(stream=stream)

def __dlpack_device__(self):
   return self._array_obj.__dlpack_device__()

Also:

def from_dlpack(obj):
    "Docstring"
    usm_ary = dpt.from_dlpack(obj)
    dpnp_ary = dpnp_array.__new__()
    dpnp_ary._array_obj = usm_ary
    return dpnp_ary 

It should be possible to use mpi4py from Intel channel to broadcast dpnp arrays.

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