community(you): Integrate You.com conversational APIs

[christeefy]

You.com is releasing two new conversational APIs — Smart and Research.

This PR:

• integrates those APIs with Langchain, as an LLM
• streaming is supported

If no one reviews your PR within a few days, please @-mention one of baskaryan, efriis, eyurtsev, ccurme, vbarda, hwchase17.

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Name	Status	Preview	Comments	Updated (UTC)
langchain	⬜️ Ignored (Inspect)	Visit Preview		Jun 24, 2024 3:13pm

[hwchase17]

these are cool! i think you need to merge master before CI can run

[christeefy]

Only adding unit tests for the .invoke method.

I do not know how to use the requests_mock library to mock a stream of bytes. I've attempted to use requests.post(..., content=content_callback) where content_callback returns a whole byte string but the BaseLLM.stream method raises an error. If I have force content_callback to return a generator of byte tokens, requests_mock instead raises an error expecting content_callback to return only one byte string.

[rmcarthur]

Checking in from You.com. We are hoping to rapidly increase and improve APIs. Let me know if we can support in any way.

[rmcarthur]

@hwchase17 how do we get this merged?

[christeefy]

@ccurme, since you previously reviewed a related #22622, could you help us to get this over the line?
Thank you very much in advance!

[christeefy]

Thanks @ccurme!