Add an example of Guidance + AutoGen

[gagb]

IndyDevDan just dropped an incredible video of using Guidance to ensure structured JSON responses from AutoGen agents. It would be a good idea to add an example related to this because so many people have been asking for it.

Video: https://www.youtube.com/watch?v=XGCWyfA3rgQ&t=142s

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1. Add examples constrained generation + multi-step reasoning via Guidance + AutoGen #937
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[qingyun-wu]

I believe @skzhang1 might be interested in help add this.

[mcchung52g]

I'm also interested in this. Currently having some hard time putting the two together because guidance now has a new syntax and autogen doesn't support llm other than via api and the only way to integrate is to hook into autogen's generate reply method. If I'm wrong, pls correct me. Any example/help/lead will be great. Thanks!