Add message/client-summary endpoint docs

[vladvelici]

Description

Add client-summary endpoint docs. https://ably.atlassian.net/browse/CHA-1199

I wasn't sure how to document the response of the summary. It's the just the annotation summary, clipped, and only including the entries that are relevant for the requested clientId. Should I add an example? I just copied the text that describes the summary from the _message_annotations partial.

Checklist

• [ ] Commits have been rebased.
• [ ] Linting has been run against the changed file(s).
• [ ] The PR adheres to the writing style guide and contribution guide.

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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 annotations-rest-api-client-summary

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