Add some missing MainActor annotations #50

Job	Run time
Test Linux	34s
Test Linux	44s
Test Linux	44s
Test (platform=macOS)	36s
Test (platform=macOS)	33s
Test (platform=macOS)	33s
Test (platform=iOS Simulator,name=iPhone 15)	4m 30s
Test (platform=iOS Simulator,name=iPhone 15)	4m 55s
Test (platform=iOS Simulator,name=iPhone 15)	4m 55s
Test (platform=tvOS Simulator,name=Apple TV)	51s
Test (platform=tvOS Simulator,name=Apple TV)	52s
Test (platform=tvOS Simulator,name=Apple TV)	52s
Test (platform=visionOS Simulator,name=Apple Vision Pro)	34m 42s
Test (platform=visionOS Simulator,name=Apple Vision Pro)	1h 50m 29s
Test (platform=visionOS Simulator,name=Apple Vision Pro)	11m 12s
Test (platform=watchOS Simulator,name=Apple Watch Series 6 (40mm))	1m 32s
Test (platform=watchOS Simulator,name=Apple Watch Series 6 (40mm))	1m 7s
Test (platform=watchOS Simulator,name=Apple Watch Series 6 (40mm))	1m 7s
Test (platform=macOS,variant=Mac Catalyst)	35s
Test (platform=macOS,variant=Mac Catalyst)	37s
Test (platform=macOS,variant=Mac Catalyst)	37s
	3h 2m 37s

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