Treat warnings as errors via package manifest

[lawrence-forooghian]

Note: This PR is based on top of #364; please review that one first.

This is a new feature of Swift 6.2 and greatly simplifies building the library (and means we'll now catch warnings when doing platform-specific builds via xcodebuild too, which we couldn't before).

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📥 Commits

Reviewing files that changed from the base of the PR and between 5009845 and a78e4ae.

📒 Files selected for processing (6)

• .github/workflows/check.yaml (2 hunks)
• Package.swift (1 hunks)
• Sources/BuildTool/XcodeRunner.swift (0 hunks)
• Tests/AblyChatTests/DefaultRoomOccupancyTests.swift (1 hunks)
• Tests/AblyChatTests/JSONValueTests.swift (2 hunks)
• Tests/AblyChatTests/MessageSubscriptionAsyncSequenceTests.swift (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch warnings-as-errors-via-SPM

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