Expose configuration options in GraphCypherQAChain (#12159)
Allows for passing arguments into the LLM chains used by the
GraphCypherQAChain. This is to address a request by a user to include
memory in the Cypher creating chain. Will keep the prompt variables
as-is to be backward compatible. But, would be a good idea to deprecate
them and use the **kwargs variables. Added a test case.
In general, I think it would be good for any chain to automatically pass
in a readonlymemory(of its input) to its subchains whilist allowing for
an override. But, this would be a different change.
