Check

Implement the `Subscription` type #134

Job	Run time
lint	41s
generate-matrices	29s
SPM (Xcode 15.3)	48s
Example app, macOS (Xcode 15.3, Swift 5)	1m 34s
SPM (Xcode 16-beta)	58s
Xcode, macOS (Xcode 15.3)	1m 53s
Example app, macOS (Xcode 16-beta, Swift 6)	2m 31s
Example app, iOS (Xcode 15.3, Swift 5)	1m 25s
Example app, iOS (Xcode 16-beta, Swift 6)	2m 25s
Example app, tvOS (Xcode 15.3, Swift 5)	1m 39s
Xcode, macOS (Xcode 16-beta)	2m 0s
Example app, tvOS (Xcode 16-beta, Swift 6)	1m 53s
Xcode, iOS (Xcode 15.3)	2m 24s
Xcode, iOS (Xcode 16-beta)	2m 28s
Xcode, tvOS (Xcode 15.3)	2m 13s
Xcode, tvOS (Xcode 16-beta)	2m 38s
all-checks-completed	1s
	28m 0s

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