Added sample showing how to do cancellations

[KrzysztofCwalina]

No description provided.

[joseharriaga]

This BinaryContent contains the JSON for one message:

{
    "role": "user",
    "content": "Say \u0027this is a test.\u0027"
}

This will result in a 400 error.

The appropriate format should be:

{
    "model": "gpt-4o",
    "messages": [
        {
            "role": "user",
            "content": "Say \u0027this is a test.\u0027"
        }
    ]
}

[KrzysztofCwalina]

Yeah, I forgot about this. Now I get the context of your question about models not corresponding 1-1 to the payloads returned from protocol methods. I also don't think that we can get to 100% of 1-1 mappings, unless we introduce the concept of "protocol models", which i am not sure is worth it.