feat: Add opt-in identityMode pointer for SwiftHeapObject wrapper identity caching #31

Job	Run time
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	55s
check-bridgejs-generated	2m 34s
format	34s
Build for native target (macos-15, Xcode_16.4)	3m 57s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	56s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 18s
prettier	7s
build-examples	7m 27s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	53s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	55s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 8s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 48s
deploy-examples	1s
	27m 33s

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