Is your feature request related to a problem? Please describe.

Support these 2 new parameters in the latest OpenAI chat completions API:

• store = [true|false]: https://platform.openai.com/docs/api-reference/chat/create#chat-create-store
• metadata = Map<String, String> : https://platform.openai.com/docs/api-reference/chat/create#chat-create-metadata

Additional context
These parameters are used for distillation. I don't think Azure supports it yet, but I'd like to at least use the client API against OpenAI endpoints. https://platform.openai.com/docs/guides/distillation

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