Can the Neo4jGraph have an input of schema?

[IvanReznikov]

Checked

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Feature request

Pass schema to Neo4jGraph

Motivation

Every time a user connects to a Neo4jGraph is initialized. If the graph is large, in order to generate a schema, a refresh_schema=True is passed and calls a refresh_schema() method, that for a large graph takes sometime to run. For a static graph, would be nice instead of initializing a schema like that, pass it as optional parameter.

I can do the pr myself

Proposal (If applicable)

#in Neo4jGraph from langchain_community.graphs

def init( ..., schema: str = "", ...)

if schema:
self.schema: str = schema