add cookbook for ragbench

[wangboyu-langya]

Description

Add a cookbook and some necessary helper functions to let the user easily evaluate RAG performance with ragbench dataset.

Motivation and Context

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• Example (update in the folder of example)

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[willshang76]

I think that only thing missing is wiring things up to generate the final result. We recently merged #1181 which is a really good pattern for us to follow. Could you help follow that PR and move this into the benchmarks folder. Thanks!

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