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fix: give every parsed object a node spanning its source #1468

Job	Run time
Grammar Choice Conflicts	27s
Gradle Check (windows-latest)	5m 27s
Gradle Check (macos-latest)	3m 2s
Gradle Check (ubuntu-latest)	4m 20s
Maven Verify (windows-latest)	6m 42s
Maven Verify (macos-latest)	7m 4s
Maven Verify (ubuntu-latest)	3m 17s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	30m 19s