BridgeJS: Support optional @JSClass as exported function parameters #2676

Job	Run time
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 55s
build-examples	20m 56s
format	34s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	12m 0s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	18m 12s
prettier	12s
Build for native target (macos-15, Xcode_16.4)	2m 38s
check-bridgejs-generated	2m 43s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 20s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 42s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 26s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	4m 8s
deploy-examples	0s
	1h 33m 46s

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