Add SwiftToSkeleton unified Swift-to-skeleton API (#516) #1944

Job	Run time
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 3s
build-examples	42m 18s
check-bridgejs-generated	2m 44s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	16m 49s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 40s
format	33s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 52s
Build for native target (macos-15, Xcode_16.4)	3m 9s
deploy-examples	8s
	1h 45m 16s

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