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d4e8e0f5 - Add example for question answering over documents with OpenAI Function Agent (#6448)

Add example for question answering over documents with OpenAI Function Agent (#6448) This PR adds an example of doing question answering over documents using OpenAI Function Agents. #### Who can review? @hwchase17 --------- Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>