Add evaluation using LangChain.js tools

[sinedied]

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• [x] In /test folder, create a new folder for evaluation
• [ ] ~~Use LangChain.js criteria evaluation~~ to demonstrate evaluation of RAG results for differents KPIs or maybe Promptfoo?
• [ ] Add docs on how to run and update the evaluations

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[github-actions[bot]]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this issue will be closed.