[RTL5] Incomplete spec implementation for channel DETACH/ATTACH

[sacOO7]

• Currently, as a part of RTL5, we only check for initialized, attaching, detaching and detached states.
• We are missing cases for the channel suspended and failed states, RTL5b and RTL5j.
• We have complete implementation for the same in case of ably-go detach.
• These checks are needed as a part of chat-kotlin-room-lifecycle internal rollbacks.
• Ideally, should also check for inconsistent connection states, CLOSING or FAILED as per RTL5g
• Need to add unit tests for the same.

┆Issue is synchronized with this Jira Task by Unito