Add cookbook for audio evals

[hendrytl]

Summary

Audio eval support was recently added to the evals product. This cookbook gives customers an example of how to use the new feature.

Motivation

We have existing customers wanting to try this out and this is the best way to show them how to use it. It also aligns well with the image eval example we recently released.

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[HSG-OAI]

Left a few comments!

[HSG-OAI]

Changes look great! Thanks Todd