feat: Add opt-in identityMode pointer for SwiftHeapObject wrapper identity caching #33

Job	Run time
prettier	9s
build-examples	18m 9s
Build for native target (macos-15, Xcode_16.4)	1m 56s
check-bridgejs-generated	2m 31s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 15s
format	44s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	3m 4s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 9s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	2m 49s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	3m 3s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 6s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	3m 3s
deploy-examples	-1s
	44m 57s

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