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Implement `__usm_ndarray_`_ protocol (#2261)

The PR is intended to adopt to dpctl changes implemented in
[dpctl#1959](https://github.com/IntelPython/dpctl/pull/1959).

It implements support of `__usm_ndarray__` protocol for `dpnp.ndarray`
and returns a property with `dpctl.tensor.usm_ndarray` instance
corresponding to the content of the array object.

This property is intended to speed-up conversion from `dpnp.ndarray` to
`dpt.usm_ndarray` in `x=dpt.asarray(dpnp_array_obj)`.
The input object that implements `__usm_ndarray__` is recognized as
owner of USM allocation that is managed by a smart pointer, and
asynchronous deallocation of `x` need not involve GIL.

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