BridgeJS: Add support for exporting structs using a box #2623

Job	Run time
check-bridgejs-generated	19s
format	29s
build-examples	6s
Build for native target (macos-15, Xcode_16.4)	25s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	8s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	19s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	23s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	5s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	12s
prettier	7s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	48s
deploy-examples	1s
	3m 39s

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