BridgeJS: Generate `_JSBridgedClass` conformance via macro #1916

Job	Run time
check-bridgejs-generated	2m 55s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	16m 52s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 6s
build-examples	43m 16s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 12s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	12m 34s
format	32s
Build for native target (macos-15, Xcode_16.4)	1m 45s
deploy-examples	0s
	1h 44m 12s

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