FEAT: Refactored SelfAskGptClassifier into SelfAskScore class and added Likert scale scoring

[blakebullwinkel]

Description

This PR refactors SelfAskGptClassifier and adds SelfAskGptLikertScorer, which scores responses on a Likert scale. Both of these scorers inherit from a generalized SelfAskScore class, which takes both a system prompt and a classifier as input. This also enables the creation of custom scorers that require new system prompts. Kudos to @dlmgary for writing the original implementation of SelfAskScore!

In addition, this PR includes many new classifiers to score different types of content in score/content_classifiers.

Tests and Documentation

This PR updates the scoring.ipynb notebook and provides an example of how to use SelfAskGptClassifier, SelfAskGptLikertScorer, as well as the base SelfAskScore class. I made change to scoring.py and ran JupyText to format the demo notebook.

Currently, no tests exist for scorers, and this PR does not add any (yet).

[romanlutz]

Do we want to add tests here? Personally, I'm fine with adding a story for that, too, since you worked on a part of code that didn't have tests.

[nina-msft]

Whoops apologies - seems like I was reviewing on an older commit but I think most of my comments still stand. Lmk if you want to talk about anything :)

[nina-msft]

Looks good to me - there are some nits that I noticed on spelling etc. that I can handle in my next PR that'll come out re: this. Great work!