Add opt-in tracing hooks for JS bridge #2014

Job	Run time
Build for native target (macos-15, Xcode_16.4)	2m 56s
check-bridgejs-generated	2m 51s
format	31s
build-examples	43m 23s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	3h 9m 56s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	3h 9m 55s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	3h 9m 56s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	3h 9m 58s
deploy-examples	-1s
	13h 29m 25s

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