Support for Creation of Embeddings for Relations in LangChain-Neo4j

[RafaelXokito]

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Feature request

LangChain-Neo4j currently only supports embeddings creation for nodes but lacks functionality for creating embeddings for relationships in Neo4j which was introduced by Neo4j recently. This feature would enable users to embed relationship data, improving the representation and analysis of graph data.

Motivation

Integrating this would ensure LangChain stays aligned with Neo4j’s latest capabilities, offering a more comprehensive tool for users working with graph databases.

Proposal (If applicable)

Introduce a new method to create embeddings for relationships in LangChain, similar to the existing node embedding methods. #23725