fix(openai): Improve reasoning parameter handling

[vprashrex]

Issue: #1002

Summary

• Before: The handling of the reasoning parameter in OpenAI mapping was inconsistent.
• Now: The reasoning parameter is updated and handled more effectively in the OpenAI mapping.
• Required updates to the parameter handling logic.
• Adjustments to maintain compatibility with existing mapping functionality.

Checklist

Before submitting a pull request, please ensure that you mark these tasks.

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

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[github-actions]

OpenAPI changes   ⚪ No API surface changes

Note

This PR does not modify the API contract.

_{main ↔ 6053fa4e · generated by oasdiff}

[codecov]

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✅ All modified and coverable lines are covered by tests.

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[github-actions]

🎉 This PR is included in version 1.3.0-main.3 🎉

The release is available on GitHub release

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