BridgeJS: Add support for exporting structs using a box #2622

Job	Run time
format	33s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	2m 10s
Build for native target (macos-15, Xcode_16.4)	2m 13s
check-bridgejs-generated	2m 17s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 6s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	2m 25s
build-examples	2m 24s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	2m 23s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	2m 17s
prettier	10s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	2m 10s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	2m 23s
deploy-examples	1s
	23m 32s

Provide feedback