[Issue]: Revisit AG2 ChatCompletionMessage, ChatCompletionMessageFunctionToolCall etc to see why we can't use OAI native ones

[randombet]

Describe the issue

AG2 internal ChatCompletionMessage adds some limitation when OAI model evolve. I understand we may need some internal objects to make AG2 compatible to other models, i.e. Gemini. But we have two conversions

1. OAI ChatCompletionMessage -> AG2 ChatCompletionMessage
2. Gemini ChatCompletionMessage -> AG2 ChatCompletionMessage

If we use a simple wrapper on top of OAI ChatCompletionMessage, we may only need the 2nd conversion and will reduce our work on maintain convertion like OAI ChatCompletionMessage -> AG2 ChatCompletionMessage

Steps to reproduce

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Screenshots and logs

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Additional Information

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[randombet]

@priyansh4320 Could you verify if my claim is valid? If yes, could you list the items we need to work on to make it work?

[priyansh4320]

@randombet will take a look.