Add SwiftToSkeleton unified Swift-to-skeleton API #1942

Job	Run time
check-bridgejs-generated	2m 52s
build-examples	41m 5s
Build for native target (macos-15, Xcode_16.4)	3m 41s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 23s
format	31s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 34s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 37s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 9s
deploy-examples	0s
	1h 44m 52s

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