BridgeJS: Re-land extension method support (reverted in #703) (#706) #2513

Job	Run time
build-examples	19m 25s
Build for native target (macos-15, Xcode_16.4)	2m 46s
format	33s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 45s
prettier	8s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 5s
check-bridgejs-generated	2m 51s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 20s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 57s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	16m 59s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 35s
deploy-examples	8s
	1h 28m 32s

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