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fix: return UnsupportedStatement for CREATE forms that no rule models #1448

Job	Run time
Gradle Check (windows-latest)	5m 19s
Grammar Choice Conflicts	26s
Gradle Check (ubuntu-latest)	4m 18s
Gradle Check (macos-latest)	4m 50s
Maven Verify (windows-latest)	6m 6s
Maven Verify (ubuntu-latest)	4m 55s
Maven Verify (macos-latest)	6m 0s
Build & Deploy Sphinx Docs	-1s
Gradle Publish (Maven Central)	-1s
	31m 52s