Add a jq or json extra

[Jeremiah-England]

Checked

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Feature request

There should be a jq or json extra.

Motivation

That's the standard way to include optional dependencies.

Right now the docs just say to pip install jq if you need to use the JSONLoader feature.

• https://python.langchain.com/docs/how_to/document_loader_json/

Proposal (If applicable)

No response