Document additional helper classes for gr.Chatbot

[abidlabs]

Documents OptionDict and MetadataDict, which are referenced in the docs for gr.Chatbot/gr.ChatInterface

[gradio-pr-bot]

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Install Gradio from this PR

pip install https://gradio-pypi-previews.s3.amazonaws.com/0f3362108808cd37b1614c2eb4b10997335d0eec/gradio-5.12.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@0f3362108808cd37b1614c2eb4b10997335d0eec#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/0f3362108808cd37b1614c2eb4b10997335d0eec/gradio-client-1.10.0.tgz

Use Lite from this PR

<script type="module" src="https://gradio-lite-previews.s3.amazonaws.com/0f3362108808cd37b1614c2eb4b10997335d0eec/dist/lite.js""></script>

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Document additional helper classes for gr.Chatbot

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[aliabd]

@abidlabs i pushed a commit for a manual fix for now, but will fix how we handle typedicts moving forward.

Looks good to merge now, just double check: https://ecf44c05.gradio-website.pages.dev/main/docs/gradio/chatbot#metadata-dict

[abidlabs]

Made some tweaks:

Should be good now, I'll merge it in in the morning unless you have any objections @aliabd