feat(genai-openai): OpenAI responses extractors (#4337)

* wip: pydantic based responses api attributes extraction.

* polish: fixing the linting around files.

* refactor: update changelog.

* polish: removing pydantic hard dependency and making pydantic version compatible with openai supported version.

* wip: tox validation for pydantic 1.x version.

* generated new workflows.

* adding the pydantic test to new test file and removing old files.

* wip: generated workflows.

* wip: removed unwanted truthiness checks and simplified the test suite.

* polish: fixed precommit.

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Co-authored-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>