Add `Deserialize` to `OpenAIConfig` and `AzureConfig` about async-openai

[64bit]

It sounds like it would have been easier if you sent PR to this repo instead.

Contributions are welcome!

[ifsheldon]

I was about to, but I didn't want to make a PR that adds a feature without proper discussion, which is rude from my view.

There are a couple of issues:

• Should we add Serialize as well? It just a convenient derive, but should we?
• As far as I know, OpenAI requires at least an API key, so the other fields in OpenAIConfig are optional. To make them optional in deserialization, we need to change them to Option<String>, so this change leads to broader impacts I guess

I will make a PR, though.

[64bit]

Thank you for elaborating.

I think there is no downside to adding Serialize as well - at least you'll have the machinery to read from and write to config files without introducing any breaking change like making fields Optional - just that all the fields can be stored in config file to later Deserilaize.

If the semantics of required-fields and optional-fields are required in config file then you're welcome to send follow up PR - we'll just have to do a version bump for breaking change.