Update openai_classifier.py to add a client option

[ycysuk]

Feature request: add openai compatiable API to OpenAIClassifier

Fixes #361

Summary

Changes

Add a client option to pass by a openai compatiable API, same as OpenAIAgent

class OpenAIClassifierOptions:
    def __init__(self,
                 api_key: str,
                 model_id: Optional[str] = None,
                 inference_config: Optional[Dict[str, Any]] = None,
                 client: Optional[Any] = None):
        self.api_key = api_key
        self.model_id = model_id
        self.inference_config = inference_config or {}
        self.client = client

class OpenAIClassifier(Classifier):
    def __init__(self, options: OpenAIClassifierOptions):
        ...
        if options.client:
            self.client = options.client
        else:
            self.client = OpenAI(api_key=options.api_key)
        ...

User experience

client = OpenAI(api_key='your api key', base_url='openai compatiable api')
classifier=OpenAIClassifier(OpenAIClassifierOptions(
            api_key=api_key,
            model_id='your model id',
            client=client))

Checklist

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• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• I have linked this PR to an existing issue (required)

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

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