WIP: faster JSObjectSpace (JS runtime retain / release) #2437

Job	Run time
check-bridgejs-generated	2m 54s
Build for native target (macos-15, Xcode_16.4)	3m 23s
prettier	9s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 1s
format	36s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 10s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 24s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 12s
build-examples	19m 0s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 54s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 10s
deploy-examples	0s
	1h 28m 53s

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