docs: add langchain dappier retriever integration notebooks

[amaan-ai20]

Add a retriever to interact with Dappier APIs with an example notebook.

The retriever can be invoked with:

from langchain_dappier import DappierRetriever

retriever = DappierRetriever(
    data_model_id="dm_01jagy9nqaeer9hxx8z1sk1jx6",
    k=5
)

retriever.invoke("latest tech news")

To retrieve 5 documents related to latest news in the tech sector. The included notebook also includes deeper details about controlling filters such as selecting a data model, number of documents to return, site domain reference, minimum articles from the reference domain, and search algorithm, as well as including the retriever in a chain.

The integration package can be found over here - https://github.com/DappierAI/langchain-dappier

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 3, 2025 1:29pm

[amaan-ai20]

As per @ccurme suggestion, created a separate integration package.
#28889 (review)

[ccurme]

Looks great, thanks for this!

It looks like there's already a short provider page for Dappier AI that showcases the ChatDappierAI in langchain-community:

• mdx file
• preview

Would you mind updating that page, instead of adding a new one? (I'm not sure to what extent the chat model is still relevant.)

[amaan-ai20]

@ccurme Thanks for the review. I have made the suggested changes.