Add Utilities/setup-dev.sh for one-command contributor setup (#726) #55

Job	Run time
Build for native target (macos-15, Xcode_16.4)	2m 9s
check-bridgejs-generated	2m 54s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	10m 38s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 43s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 7s
format	43s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 2s
build-examples	20m 54s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 13s
prettier	9s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	2m 53s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	13m 56s
deploy-examples	3s
	1h 26m 24s

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