Add jiter

[tbrinda]

https://github.com/pydantic/jiter/

[alexstaravoitau]

Thanks for reporting @tbrinda—looks like this should already be available in pydantic, which is pinned in Juno? Or is there a reason to have it available separately?

[ESheremetov]

jiter for the newest versions of openai lib
will be very helpful

[alexstaravoitau]

@ESheremetov I assume openai package might still work by using Pydantic's jiter? Or does it complain about jiter missing?