fix: allow STATEMENT as an unquoted identifier #1023

Job	Run time
Gradle Check (windows-latest)	4m 3s
Gradle Check (macos-latest)	3m 55s
Gradle Check (ubuntu-latest)	3m 43s
Grammar Choice Conflicts	27s
Maven Verify (macos-latest)	4m 46s
Maven Verify (windows-latest)	4m 50s
Maven Verify (ubuntu-latest)	3m 30s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	25m 14s

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