Add example for demonstration of integration dpctl in other libraries

[PokhodenkoSA]

Requested from dpnp and daal4py.

/CC @shssf @Alexander-Makaryev @napetrov

[diptorupd]

@oleksandr-pavlyk Any thoughts on how the ticket should be addressed? I think it can be expanded and treated as part of overall documentation improvements.

[oleksandr-pavlyk]

dpctl provides data container,dpctl.tensor.usm_ndarray, and a set of operations to operate on it as specified in Python Array API standard.

dpnp builds on such a container, and so does scikit-learn-intelex