Check

Implement the `Subscription` type #118

Job	Run time
lint	43s
generate-matrices	33s
SPM (Xcode 15.3, Swift 5)	47s
Xcode, macOS (Xcode 15.3, Swift 5)	2m 46s
SPM (Xcode 16-beta, Swift 6)	55s
Example app, macOS (Xcode 15.3, Swift 5)	1m 48s
Xcode, iOS (Xcode 15.3, Swift 5)	1m 55s
Example app, iOS (Xcode 15.3, Swift 5)	2m 3s
Xcode, tvOS (Xcode 15.3, Swift 5)	1m 32s
Example app, tvOS (Xcode 15.3, Swift 5)	1m 50s
Xcode, macOS (Xcode 16-beta, Swift 6)	2m 8s
Example app, macOS (Xcode 16-beta, Swift 6)	2m 4s
Xcode, iOS (Xcode 16-beta, Swift 6)	1m 36s
Example app, iOS (Xcode 16-beta, Swift 6)	2m 30s
Xcode, tvOS (Xcode 16-beta, Swift 6)	2m 24s
Example app, tvOS (Xcode 16-beta, Swift 6)	2m 23s
all-checks-completed	0s
	27m 57s

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