RFC Implementation: Unify JSFunction and JSObject for consistent type system #1666

Job	Run time
Build for native target (macos-15, Xcode_16.4)	40s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	1m 45s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.0.2-release/ubuntu2204/swift-6.0...	1m 35s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	1m 35s
build-examples	2m 16s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	1m 31s
format	39s
check-bridgejs-generated	6m 7s
deploy-examples	-1s
	16m 7s

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