Allow logging request body

Confirm this is a feature request for the Python library and not the underlying OpenAI API.

• This is a feature request for the Python library

Describe the feature or improvement you're requesting

It would be nice to be able to be able to log the body of the requests.
I needed to see what was sent over the wire, so I checked how to log body requests.
Turns out, there's no way.

I needed to modify this, in order to do it.
https://github.com/openai/openai-python/blob/58bec2ffe5274b37fed3adad8da188f0cbc5406c/src/openai/_base_client.py#L447-L448

Could you add support to log body requests?

I'm not sure if this is the only place that has to change.
In fact, I just ended capturing network traffic just to be sure.
Having to resort to this kind of technique, is not nice.

I'm aware that you can log request/response using a custom httpx client with a custom transport: https://github.com/encode/httpx/discussions/3073

EDIT: the same applies to responses body

Additional context

No response

Read src/openai/_base_client.py around lines 447-448 and review the linked custom httpx transport discussion. Trace how request and response bodies are handled, then determine the supported logging behavior needed for both; done means callers can inspect those bodies without capturing network traffic.