Support `rnet` as http client (rust backed)

[ion-elgreco]

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

Great to see aiohttp as optional http client, this is a huge step. We might take it a step further and have this work with rnet as well https://github.com/0x676e67/rnet

Additional context

No response