BridgeJS: Add missing `function` keyword for namespace function declarations in TypeScript #2164

Job	Run time
format	33s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 42s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 55s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 9s
Build for native target (macos-15, Xcode_16.4)	3m 7s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 6s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 29s
check-bridgejs-generated	2m 34s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	16m 57s
build-examples	26m 1s
deploy-examples	-1s
	1h 34m 32s

Provide feedback