BridgeJS: Support throws and async for closures #108

Job	Run time
build-examples	55m 55s
format	37s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 11s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	20m 31s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	15m 8s
Build for native target (macos-15, Xcode_26.0.1)	3m 30s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 1s
prettier	12s
check-bridgejs-generated	3m 21s
deploy-examples	0s
	1h 54m 26s

Provide feedback