Add visionOS support. #259

Job	Run time
swift (debug)	2m 27s
swift (release)	2m 44s
xcodebuild (ios, Debug)	5m 16s
xcodebuild (ios, Release)	5m 0s
xcodebuild (macos, Debug)	2m 51s
xcodebuild (macos, Release)	2m 54s
xcodebuild (tvos, Debug)	3m 19s
xcodebuild (tvos, Release)	3m 5s
xcodebuild (visionos, Debug)	4m 46s
xcodebuild (visionos, Release)	5m 36s
xcodebuild (watchos, Debug)	1m 7s
xcodebuild (watchos, Release)	1m 6s
	40m 11s

Provide feedback