experiment: Add "swift" identityMode — Swift-owned identity cache #53

Job	Run time
check-bridgejs-generated	2m 48s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 10s
format	1m 29s
prettier	12s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	14m 9s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 6s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	2m 52s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 32s
Build for native target (macos-15, Xcode_16.4)	2m 53s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 16s
build-examples	20m 30s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 42s
deploy-examples	0s
	1h 31m 39s

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