experiment: Add "swift" identityMode — Swift-owned identity cache #50

Job	Run time
prettier	13s
check-bridgejs-generated	2m 50s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 9s
format	36s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 0s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 26s
build-examples	20m 50s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 43s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	12m 58s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	18m 9s
Build for native target (macos-15, Xcode_16.4)	3m 25s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 6s
deploy-examples	0s
	1h 35m 25s

Provide feedback