Ekzhu structured message

[abhinav-aegis]

Why are these changes needed?

Related issue number

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This does not close #4623 but helps with integrating Structured message into Assistant agents. There are two primary changes:

1. Adding a format_string to StructuredMessage. This is allows us to create sensible strings from the StructuredMessage instead of just a simple model_dump if converting.
2. Added class StructuredMessageComponent(ComponentBase[StructureMessageConfig], Component[StructureMessageConfig]) that uses the Utility class autogen_agentchat.utils.JSONSchemaToPydantic to deserialize json schema to dynamically generated Pydantic classes.

[abhinav-aegis]

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[abhinav-aegis]

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[ekzhu]

Thanks! Can we target this to main once the #5131 is merged?