Support for Weaviate client v3 with @langchain/weaviate library

[pnutmath]

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Feature request

I would like to propose adding support for the Weaviate client v3 to the @langchain/weaviate package, alongside the existing support for client v2. The new client version is currently available as a release candidate (RC) and introduces several improvements and new features that would greatly benefit users of the LangChainJS library.

Motivation

The current @langchain/weaviate package supports Weaviate client v2, but the forthcoming Weaviate client v3 brings notable enhancements, including:

• Collection Object: A new collection object replaces the client object, simplifying CRUD and search operations.
• Simplified Query Construction: The removal of the builder pattern in favor of specific methods and parameters.
• Batch Insertions: An insertMany method replaces objectBatcher for more efficient batch insertions.
• Improved Data Filtering: A new Filter helper class streamlines data filtering with conditions.
• Generative Queries: Introduction of a new generate namespace for generative queries.
• Cleaner Return Objects: Enhanced return objects for easier access to key information.

These improvements can significantly enhance the development experience and performance for users integrating LangChainJS with Weaviate.

Proposal (If applicable)

No response