BridgeJS: support importing from external ECMAScript modules #2778

Job	Run time
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	15m 8s
build-examples (Basic)	10m 21s
prettier	15s
build-examples (Multithreading)	9m 45s
format	37s
build-examples (Embedded)	10m 24s
check-bridgejs-generated	3m 39s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	20m 55s
build-examples (ActorOnWebWorker)	10m 41s
build-examples (OffscrenCanvas)	10m 21s
build-examples (PlayBridgeJS)	12m 38s
Build for native target (macos-15, Xcode_26.0.1)	3m 20s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	2m 47s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 48s
deploy-examples	-1s
build-examples-deploy	-1s
	2h 3m 37s

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