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fix: give every parsed object a node spanning its source #1486

Job	Run time
Gradle Check (macos-latest)	2m 29s
Gradle Check (ubuntu-latest)	4m 11s
Grammar Choice Conflicts	30s
Gradle Check (windows-latest)	5m 28s
Maven Verify (ubuntu-latest)	4m 54s
Maven Verify (windows-latest)	6m 2s
Maven Verify (macos-latest)	5m 58s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	29m 32s