Check

Implement the `Subscription` type #119

Job	Run time
lint	46s
generate-matrices	29s
SPM (Xcode 15.3, Swift 5)	59s
Xcode, macOS (Xcode 15.3, Swift 5)	1m 50s
SPM (Xcode 16-beta, Swift 6)	42s
Example app, macOS (Xcode 15.3, Swift 5)	1m 50s
Xcode, macOS (Xcode 16-beta, Swift 6)	2m 27s
Example app, macOS (Xcode 16-beta, Swift 6)	2m 46s
Xcode, iOS (Xcode 15.3, Swift 5)	2m 16s
Example app, iOS (Xcode 15.3, Swift 5)	2m 10s
Xcode, iOS (Xcode 16-beta, Swift 6)	2m 11s
Example app, iOS (Xcode 16-beta, Swift 6)	2m 33s
Xcode, tvOS (Xcode 15.3, Swift 5)	2m 12s
Example app, tvOS (Xcode 15.3, Swift 5)	2m 16s
Example app, tvOS (Xcode 16-beta, Swift 6)	2m 35s
Xcode, tvOS (Xcode 16-beta, Swift 6)	1m 46s
all-checks-completed	0s
	29m 48s

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