[ECO-5577, WIP] Pre-v1 public API changes for chat-swift

[lawrence-forooghian]

Incorporates the public API changes from the following PRs:

• [ECO-5577] Rename DefaultChatClient to ChatClient ably-chat-swift#366
• [ECO-5577] Pre-v1 public API audit ably-chat-swift#358

(more to come, see ably/ably-chat-swift#399)

Description

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 chat-swift-pre-v1-public-api-changes

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