refactor(inspect-history): Refactor providers

[christeefy]

A small PR to refactor redundant logic within the dspy.LM.inspect_history method.

I came across this when trying to integrate a custom LLM — inspect_history expects a particular schema from self.history[i]['requests'] that isn't documented in the docs. These if/else statements indicate a deficiency of the existing interface.

I'm happy to extend in the interface across all LM subclasses, cleaning up the if/else statement here and update the docs. However, I would first like to understand what is the concept of "choices" in printed.append("<prompt>", "<choices>"), and possibly some guidance on the proper interface if you have any.

Thanks!

[okhat]

Thank you. Yeah this is a mess right now and a deeper refactor is always welcome but do coordinate with the release candidate branch

[christeefy]

Thanks @okhat. Where may I find the release candidate branch?

[tom-doerr]

@christeefy The branch has the name rc. https://github.com/stanfordnlp/dspy/tree/rc