Add evaluation using LangChain.js tools

[sinedied]

• 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

[github-actions]

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.

[github-actions]

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.

[github-actions]

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.

[github-actions]

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.

[github-actions]

This issue was closed because it has been stalled for 7 days with no activity.