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.

• Have you provided a meaningful PR description?
• Have you added a test, reproducer or referred to an issue with a reproducer?
• Have you tested your changes locally for CPU and GPU devices?
• Have you made sure that new changes do not introduce compiler warnings?
• Have you checked performance impact of proposed changes?
• Have you added documentation for your changes, if necessary?
• Have you added your changes to the changelog?

[github-actions]

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

[github-actions]

Array API standard conformance tests for dpnp=0.20.0dev2=py313h509198e_25 ran successfully.
Passed: 1227
Failed: 0
Skipped: 9

[vlad-perevezentsev]

LGTM
Thank you @antonwolfy for implementing the first step in transferring dpctl.tensor to dpnp