Generate current service sources from discovery. #215

Job	Run time
swift (debug)	1m 13s
xcodebuild (ios, Debug)	6m 26s
swift (release)	1m 38s
xcodebuild (ios, Release)	11m 14s
xcodebuild (macos, Debug)	3m 43s
xcodebuild (macos, Release)	5m 17s
xcodebuild (tvos, Debug)	4m 31s
xcodebuild (tvos, Release)	5m 30s
xcodebuild (watchos, Debug)	6m 15s
xcodebuild (watchos, Release)	6m 52s
xcodebuild (visionos, Debug)	4m 35s
xcodebuild (visionos, Release)	5m 41s
	1h 2m 55s

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