DRAFT: Add Graph store and Graph QA

[gkorland]

An initial PR just to see that I'm building the right API.
Fixes #2383

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Name	Status	Preview	Updated (UTC)
langchainjs-docs	✅ Ready (Inspect)	Visit Preview	Sep 27, 2023 10:48am

[jacoblee93]

Will have a look at this tomorrow! Apologies for the delay.

[gkorland]

@jacoblee93 no worries, I really didn't do too much, just did a very early PR to get your feedback and make sure I'm going in the right direction before I put more time.

[jacoblee93]

Hey @gkorland really sorry for the delay - had a chat with @baskaryan and I don't think we have a clear idea of the right common interface between graph stores at the moment - would you be up for implementing it like you did in Python or extending a very minimal base class?

I think adding some asRetriever() wrapper can make Falkor and other GraphDBs interact usefully with other LangChain constructs.

[gkorland]

I pushed the other day a simple interface for GraphStore see: langchain-ai/langchain#11012
https://github.com/langchain-ai/langchain/blob/f30a8465fb41788de109ea3a0a02cd855ec38d5f/libs/langchain/langchain/graphs/graph_store.py

[gkorland]

@jacoblee93 I noticed the PRs #2741 #2749 were merged so I guess there is no need for this PR, I'll submit a new PR based on these PRs

[gkorland]

@jacoblee93 see #2774