[EDU-2046] - Migrate Realtime SDK API spec Messages page to MDX

[GregHolmes]

Description

This PR converts the Realtime SDK Messages API reference page from Textile format to MDX, as part of a full textile to MDX migration.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch EDU-2046-Convert-Pub-Sub-API-messages-refs-to-MDX

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[franrob-projects]

LGTM