OpenAI's Beta Python SDK sees a rewrite using httpx, drops Azure

Some notes I made:

- Dropped Azure support (for now, maybe?)

- Switches out Requests and AIOHTTP packages for httpx.

- Switches to explicit client instantiation

Feel free to discuss what you expect this to/not to fix. So many Cloudflare 502 issues and bad gateway errors which we still get billed for, have caused the openai dev experience to be rather poor. The async/sync request timeouts don't even work as you'd expect. These may be fixed in this beta.