[DX-789] Implement message annotations

[sacOO7]

• First merge [DX-931] Fix missing message fields for channel subscribe/history #151
• Fixes https://ably.atlassian.net/browse/DX-789

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Project	Deployment	Actions	Updated (UTC)
cli-web-cli	Ready	Preview, Comment	Mar 10, 2026 8:45am

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[sacOO7]

Closing in favor of #167