Add Utilities/setup-dev.sh for one-command contributor setup (#726) #2585

Job	Run time
check-bridgejs-generated	2m 55s
prettier	11s
Build for native target (macos-15, Xcode_16.4)	1m 59s
build-examples	15m 44s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 59s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 12s
format	31s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	2m 51s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 10s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 6s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 21s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 10s
deploy-examples	8s
	1h 27m 17s

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