BridgeJS: Support throws and async for closures #92

Job	Run time
prettier	11s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	14m 4s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 9s
Build for native target (macos-15, Xcode_16.4)	2m 40s
check-bridgejs-generated	2m 43s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 59s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 45s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 22s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	16m 47s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 8s
build-examples	20m 27s
format	31s
deploy-examples	0s
	1h 31m 46s

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