Add getRootNode to TaskComposerGraph and update TaskComposerNodeInfo … #538

Job	Run time
build-macos (macos-12, x64-osx-dynamic-release, x64, /usr/local)	54m 55s
build-macos (macos-14, arm64-osx-dynamic-release, arm64, /opt/homebrew)	34m 18s
	1h 29m 13s

Provide feedback