BridgeJS: Add `JSTypedClosure` API #2131

Job	Run time
check-bridgejs-generated	2m 41s
build-examples	17m 43s
format	30s
Build for native target (macos-15, Xcode_16.4)	3m 22s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	3m 40s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	3m 51s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 39s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	3m 34s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	2m 58s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	3m 43s
deploy-examples	0s
	44m 41s

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