TS2Swift: treat callable exported consts as functions #2350

Job	Run time
check-bridgejs-generated	2m 42s
Build for native target (macos-15, Xcode_16.4)	2m 14s
format	29s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 3s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 24s
prettier	7s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 52s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 25s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 47s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 53s
build-examples	19m 27s
deploy-examples	-1s
	1h 28m 22s

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