feat: Add opt-in identityMode pointer for SwiftHeapObject wrapper identity caching #36

Job	Run time
check-bridgejs-generated	2m 28s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 30s
build-examples	8m 37s
format	32s
prettier	17s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 8s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	8m 11s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	8m 10s
Build for native target (macos-15, Xcode_16.4)	3m 11s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	8m 11s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 17s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	8m 11s
deploy-examples	1s
	57m 44s

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