Add --includes and --include-dir to dpnp CLI

[vlad-perevezentsev]

This PR adds --includes and --include-dir options to dpnp CLI (python -m dpnp)

These options return the path to dpnp/backend include directory containing dpnp4pybind11.hpp

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/pull/2916/index.html

[github-actions]

Array API standard conformance tests for dpnp=0.21.0dev0=py313h509198e_38 ran successfully.
Passed: 1356
Failed: 4
Skipped: 16

[coveralls]

coverage: 78.21% (-0.1%) from 78.324% — add_dpnp_cli_options into master

[ndgrigorian]

LGTM

[antonwolfy]

The only concern is about documentation, but can be covered separately

[antonwolfy]

extra blank line

Suggested change

[antonwolfy]

Suggested change

	"""Prints path to dpnp libtensor include directory"""
	"""Returns path to dpnp libtensor include directory"""

[antonwolfy]

Suggested change

	The ``python -m dpnp`` command provides options to query include paths
	needed for building C++ extensions against dpnp:
	The ``python -m dpnp`` command provides options to query the include paths
	needed when building C++ extensions with dpnp:

[antonwolfy]

might be helpful to add an examples:

For example, to compile a C++ extension using dpnp header using the Intel(R) oneAPI DPC++ compiler:

.. code-block:: bash

    icpx -fsycl myextension.cpp $(python -m dpnp --includes) -o myextension.so

Not sure if that works this way, based on docs/doc_sources/api_reference/dpctl_pybind11.rst from dpctl.

[ndgrigorian]

we should at least get something to work and then add it as an example.

In theory, the above should work, we just need an extension to test with