feat: Evaluating prompts at scale with Gemini Batch Prediction API

[arieljassan]

Python notebook for evaluating prompts at scale with Gemini Batch Prediction API

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[holtskinner]

Ok, only remaining item is the Looker Dashboard. Once it's publicly accessible, resolve this comment and I'll merge.

https://github.com/GoogleCloudPlatform/generative-ai/pull/907#discussion_r1695348335