Add opt-in tracing hooks for JS bridge (#548) #2021

Job	Run time
check-bridgejs-generated	2m 43s
build-examples	43m 11s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 1s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 59s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 20s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 42s
Build for native target (macos-15, Xcode_16.4)	4m 25s
format	32s
deploy-examples	9s
	1h 48m 2s

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