Chat SDK adds Messenger adapter support

Short summary

Vercel Chat SDK now supports Messenger as an adapter for building AI agents with full message, reaction, multimedia, and button support. Community-contributed feature. Documentation and custom adapter guidance available for implementation.

• •Messenger adapter enables agents to handle messages, reactions, multimedia downloads, and postback buttons with auto-fetched display names
• •Community-contributed feature from @mitkodkn (PR #461)
• •Pre-built adapters and custom adapter building guides available in Chat SDK documentation

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