surfacing `response_history` attribute from `AugmentedLLMs`

[lolrenx]

Hello,

I think there is an opportunity in surfacing the response_history attribute of AugmentedLLMs.

This would open up other analytics such as token consumption, comparison between providers, performance monitoring, model behavior patterns, and other performance metrics.

We have a PR in the works with @felixbouazza on the subject in that would be of interest :)

[saqadri]

Thanks @lolrenx! I have reviewed @felixbouazza's change #133 -- as stated in the PR comment I think it's a good change, just give me the weekend to think about it a bit more in relation to other in-flight changes.