Add opt-in tracing hooks for JS bridge #2012

Job	Run time
build-examples	43m 21s
Build for native target (macos-15, Xcode_16.4)	3m 33s
format	43s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	6h 5m 0s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	6h 5m 0s
check-bridgejs-generated	3m 0s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	6h 5m 0s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	6h 5m 0s
deploy-examples	0s
	1d 1h 10m 37s

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