Implement python array API Inspection namespace

[antonwolfy]

The PR proposes to implement dpnp.__array_namespace_info__, what is a python array API Inspection namespace.
It is required to achieve the compliance with python array API.
The implementation leverages on appropriate namespace exposed by dpctl.tensor.

In addition, this PR makes an __array_api_version__ attribute available in dpnp. It also borrowed from dpctl.

The PR adds a dedication documentation page describing Array API standard compatibility, including reference on new dpnp.__array_namespace_info__.

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[coveralls]

coverage: 71.28% (+0.005%) from 71.275%
when pulling 6b5ca27 on impl-array_namespace_info
into 0181564 on master.

[antonwolfy]

Link to rendered documentation: https://intelpython.github.io/dpnp/pull/2275/reference/array_api.html

[github-actions]

Array API standard conformance tests for dpnp=0.17.0dev5=py312he4f9c94_10 ran successfully.
Passed: 966
Failed: 1
Skipped: 33