BridgeJS: Merge small core files into single Misc.swift #1939

Job	Run time
Build for native target (macos-15, Xcode_16.4)	3m 32s
build-examples	42m 50s
check-bridgejs-generated	2m 49s
format	32s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 43s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 32s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	16m 59s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 1s
deploy-examples	-1s
	1h 45m 57s

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