BridgeJS: support closure types in imported JS APIs #1969

Job	Run time
format	31s
build-examples	42m 52s
Build for native target (macos-15, Xcode_16.4)	3m 39s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 22s
check-bridgejs-generated	2m 55s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 33s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 59s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 14s
deploy-examples	0s
	1h 46m 5s

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