Update API endpoints

It would be excellent to add the newly available API endpoints and capabilities that have been announced today, eg,
[ ] Assistants (incl. Code Interpreter): https://platform.openai.com/docs/assistants/overview
[x] Vision (with B64 encoding of images): https://platform.openai.com/docs/guides/vision
[ ] Image generation (with DALL-E 3): https://platform.openai.com/docs/guides/images/usage?context=node
[ ] Audio (TTS/STT): https://platform.openai.com/docs/guides/text-to-speech
[ ] Moderations: https://platform.openai.com/docs/guides/moderation/quickstart
[ ] Files upload: https://platform.openai.com/docs/api-reference/files
[ ] Finetuning: https://platform.openai.com/docs/guides/fine-tuning

Extending current API calls, eg,
[x] JSON mode
[x] Seed
[ ] Logprobs -- not available on the API as of 11th Nov
[ ] Function calling (available through the current interface but we should add some examples here)

Ideally, we would also add some simple examples to the docs.
There are many cool capabilities (eg, function calling, logit-bias-classifiers, ...) that are easy to do with the existing APIs, but hard to access for beginners.

I'm happy to take a stab at it over the weekend if no one is interested!