Better code blocks support in chatbot component

[dawoodkhan82]

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Describe the solution you'd like

• Use gr.Code() component within chatbot component:
• include syntax highlighting
• add frame around code block
• add copy button

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[dawoodkhan82]

I think if we can find a way to dynamically load the code component that would be best. Rather than re-implementing a worse version of the code component specifically for the chatbot. Plus there seems to be a lot of chatbot demos outputting code blocks.