Provide function call example using tool_calls

[sloganking]

https://github.com/64bit/async-openai/blob/main/examples/function-call/src/main.rs

The current function call example uses the now deprecated ChatCompletionResponseMessage::function_call field. It was deprecated in favor of ChatCompletionResponseMessage::tool_calls. Can an example be provided using the new tool_calls method?

[SpaghettiFibonacci]

Here is an example of how to use it meanwhile:

let tool = ChatCompletionToolArgs::default()
        .r#type(async_openai::types::ChatCompletionToolType::Function)
        .function(ChatCompletionFunctions { 
                name: "get_current_weather".to_string(), 
                description: Some("Get weather in location".to_string()), 
                parameters: json!({
                    "type": "object",
                    "properties": {
                        "location": {
                            "type": "string",
                            "description": "The city and state, e.g. San Francisco, CA",
                        },
                        "format": {
                            "type": "string",
                            "enum": ["celsius", "fahrenheit"],
                            "description": "The temperature unit to use. Infer this from the users location.",
                        },
                    },
                    "required": ["location", "format"],
                    
                }) 
            }).build()?;

and for the tool choice

        .tool_choice(ChatCompletionToolChoiceOption::Auto)

Though I am not sure it is working right now!

Error: ApiError(ApiError { message: "'$.tool_choice' is invalid. Please check the API reference: https://platform.openai.com/docs/api-reference.", type: Some("invalid_request_error"), param: None, code: None })

[sloganking]

Okay thanks, I will continue using the deprecated option for now and maybe come back to this when it has been tested further. or test it some on my own later.

[SpaghettiFibonacci]

When leaving out

        .tool_choice(ChatCompletionToolChoiceOption::Auto)

it should work

[64bit]

An example was added in #153. And the bug was fixed in #158

Seems like everything is resolved, hence closing the issue.