experiment: Add "swift" identityMode — Swift-owned identity cache #46

Job	Run time
build-examples	14m 32s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 19s
prettier	7s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 59s
check-bridgejs-generated	3m 12s
format	34s
Build for native target (macos-15, Xcode_16.4)	2m 57s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	2m 48s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	2m 51s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	2m 28s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	2m 50s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	2m 47s
deploy-examples	1s
	41m 25s

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