Add support for OpenAI tools and files usage in YAML schema.

[homanp]

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🔖 Feature description

Add support for OpenAI tools and files usage in YAML schema.

• If a user chooses to add files we need to create them with the OpenAI SDK: https://platform.openai.com/docs/api-reference/files. We also need to add the retrieval tool to the OAI assistant.

• If a user add tools (code interpreter, retrieval or custom functions) these need to be added to the assistant as well.

📝 Additional Context

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[homanp]

Fixed by #755

[homanp]

@elisalimli can u have a look at this please.