[AIT-287] Add the RESUMED flag to onChannelAttached

[lawrence-forooghian]

Needed for implementing RTO4d from ably/specification#416.

[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 AIT-287-add-RESUMED-to-onChannelAttached

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