Add opt-in tracing hooks for JS bridge #2007

Job	Run time
check-bridgejs-generated	2m 56s
Build for native target (macos-15, Xcode_16.4)	3m 9s
build-examples	43m 3s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	46s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	47s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	47s
format	29s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	48s
deploy-examples	-1s
	52m 44s

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