[Py OV] Add deprecation warning for runtime module

[almilosz]

Details:

Add deprecation warning for openvino.runtime that will be shown ONCE when sb will access runtime functionality for the first time. Examples:

openvino.runtime funtionality was added to openvino namespace in these PRs:

• [Py OV] Add runtime/passes to openvino namespace #27785
• [Py OV] Add op to openvino module #27902
• [Py OV] Move ie_api.py and exceptions.py files to openvino module #28007
• [Py OV] Add utils to openvino module  #28062
• [Py OV] Alias classes and functions in flatten openvino namespace #28085

Internal calls in openvino module also triggered warning, so they were updated:

• [Py OV] Replace imports of openvino.runtime in openvino module #28166
• [OVC] Update imports #28356

Tickets:

• CVS-129451

[github-actions]

This PR will be closed in a week because of 2 weeks of no activity.

[mlukasze]

@rkazants please take a look from OVC perspective

[mlukasze]

@rkazants friendly reminder, it's aimed for 25.0

[rkazants]

Why there is no warning when you import AxisVector from openvino.runtime?

[rkazants]

please make tests to cover the following cases:

1. import openvino; axis_vector = openvino.AxisVector([1, 2]) Test there is no warning and it is functional
2. import openvino; axis_vector = openvino.runtime.AxisVector([1, 2]) Test it still functional and raise a warning. And test lazy loading
3. import openvino.runtime as runtime; axis_vector = runtime.AxisVector([1, 2]) Test it still functional and raise a warning. And test lazy loading
4. import openvino.runtime; import openvino.runtime.utils How many warnings shall we get one or two?

[almilosz]

Why there is no warning when you import AxisVector from openvino.runtime?

The warning will be shown only once. If it was shown before AxisVector was used, then there will be no warning when importing AxisVector

[almilosz]

@akuporos Please look one more time on the final version we prepared and it can be merged :)