Add new header file dpnp4pybind11.hpp

[antonwolfy]

The PR adds a header file dpnp4pybind11.hpp which contains minimum necessary content to write pybind11 extensions and includes a caster for usm_ndarray and type enumerators.

This PR also includes movement for a part of dpctl.tensor header which previously used in dpnp code. It is needed to get rid of include conflicts, since now repiques including new dpnp4pybind11.hpp header everywhere.

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/pull/2734/index.html

[github-actions]

Array API standard conformance tests for dpnp=0.20.0dev1=py313h509198e_59 ran successfully.
Passed: 1229
Failed: 0
Skipped: 7