Tests

Massive project reorganization and thread-safety updates for Swift 6. #481

Job	Run time
Swift Unit Tests (macos-15-large, 5.10)	3m 4s
Xcode Unit Tests (platform=iOS Simulator,OS=16.4,name=iPhone 14 Pro Max, 15.4, macos-14-large)	12m 19s
Swift Unit Tests (macos-15-large, 6.0)	2m 57s
Xcode Unit Tests (platform=iOS Simulator,OS=18.1,name=iPhone 16 Pro Max, 16.0, macos-15-large)	8m 28s
Swift Unit Tests (ubuntu-latest, 5.10)	2m 48s
Xcode Unit Tests (platform=tvOS Simulator,OS=18.1,name=Apple TV, 16.0, macos-15-large)	6m 27s
Xcode Unit Tests (platform=visionOS Simulator,OS=1.2,name=Apple Vision Pro, 15.4, macos-14-xlarge)	9m 27s
Xcode Unit Tests (platform=visionOS Simulator,OS=2.0,name=Apple Vision Pro, 16.0, macos-15-xlarge)	6m 4s
Xcode Unit Tests (platform=watchOS Simulator,OS=11.1,name=Apple Watch Series 10 (46mm), 16.0, mac...	6m 50s
Xcode Unit Tests (platform=macOS,name=My Mac, 16.0, macos-15-large)	5m 12s
CocoaPods Build	0s
	1h 3m 36s

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