Add opt-in tracing hooks for JS bridge #2016

Job	Run time
build-examples	44m 20s
Build for native target (macos-15, Xcode_16.4)	2m 9s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	1h 17m 23s
format	31s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	1h 17m 25s
check-bridgejs-generated	2m 51s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	1h 17m 25s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	1h 17m 23s
deploy-examples	0s
	5h 59m 27s

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