Add link.dart hook #421

Job	Run time
build (ubuntu, stable, native_assets_builder, false)	3m 51s
build (ubuntu, stable, native_assets_cli, false)	2m 4s
build (ubuntu, stable, native_toolchain_c, false)	2m 5s
build (ubuntu, dev, native_assets_builder, false)	28s
build (ubuntu, dev, native_assets_cli, false)	41s
build (ubuntu, dev, native_toolchain_c, false)	20s
build (macos, stable, native_assets_builder, false)	6m 2s
build (macos, stable, native_assets_cli, false)	2m 59s
build (macos, stable, native_toolchain_c, false)	4m 57s
build (windows, stable, native_assets_builder, false)	5m 18s
build (windows, stable, native_assets_cli, false)	2m 44s
build (windows, stable, native_toolchain_c, false)	3m 54s
coverage-finished	5s
	35m 28s

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