Adding LLM eval for SQL generation notebook

[colin-openai]

Summary

Briefly describe the changes and the goal of this PR. Make sure the PR title summarizes the changes effectively.

Motivation

Why are these changes necessary? How do they improve the cookbook?

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[rishabhsagar]

Changes look good to me.

[shyamal-anadkat]

you might want to change the task description here from summary --> SQL queries

[shyamal-anadkat]

left one comment, lgtm overall.

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