BridgeJS: support closure types in imported JS APIs #1967

Job	Run time
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 3s
check-bridgejs-generated	2m 44s
Build for native target (macos-15, Xcode_16.4)	2m 46s
format	32s
build-examples	42m 44s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 1s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 16s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	13m 16s
deploy-examples	-1s
	1h 41m 21s

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