Feature/upgrade langchain dependency from 0.0332 to 0.2.5

[saminegash]

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Add directions for contributors. For example, do developers need to run poetry install after picking up these changes?

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[20001LastOrder]

Thanks for getting the upgrade done! I think can really help us move forward with LangChain versions. Please check some minor questions above and I think we are good to merge this one.

[20001LastOrder]

@saminegash Please see some responses above.

[20001LastOrder]

LGTM now