Expose default int4 config getter function

[nikita-savelyevv]

What does this PR do?

Expose a quite useful function for getting default int4 config which also tries to read model_id from config.json. Moved it from exporters.openvino to configuration.py.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?

[nikita-savelyevv]

@eaidova, please tale a look

[HuggingFaceDocBuilderDev]

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