IntelPython / dpnp / 12888946661

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Raise `TypeError` in `dpnp.ndarray.__array__` (#2260)

The PR implements `dpnp.ndarray.__array__` method that raises
`TypeError` to disallow implicit conversion of `dpnp.ndarray` to
`numpy.ndarray`.
While explicit conversion using `dpnp.ndarray.asnumpy` method is
advised.

Disallowing implicit conversion prevents `numpy.asarray(dpnp_arr)` from
creating an array of 0D `dpnp.ndarray` instances, because
using it is very costly due to multitude of short-array transfers from
GPU to host.

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