Check

Implement the `Subscription` type #131

Job	Run time
generate-matrices	33s
lint	38s
SPM (Xcode 15.3)	53s
Example app, macOS (Xcode 15.3, Swift 5)	2m 48s
SPM (Xcode 16-beta)	58s
Xcode, macOS (Xcode 15.3)	1m 51s
Example app, iOS (Xcode 15.3, Swift 5)	1m 31s
Xcode, iOS (Xcode 15.3)	1m 25s
Xcode, tvOS (Xcode 15.3)	1m 35s
Xcode, macOS (Xcode 16-beta)	2m 7s
Example app, tvOS (Xcode 15.3, Swift 5)	1m 43s
Xcode, iOS (Xcode 16-beta)	2m 48s
Example app, macOS (Xcode 16-beta, Swift 6)	2m 26s
Xcode, tvOS (Xcode 16-beta)	2m 4s
Example app, iOS (Xcode 16-beta, Swift 6)	1m 56s
Example app, tvOS (Xcode 16-beta, Swift 6)	1m 58s
all-checks-completed	0s
	27m 14s

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