feat: structure column attributes and generated expressions #871

Job	Run time
Grammar Choice Conflicts	32s
Gradle Check (windows-latest)	4m 39s
Gradle Check (macos-latest)	3m 8s
Gradle Check (ubuntu-latest)	3m 18s
Maven Verify (windows-latest)	3m 36s
Maven Verify (macos-latest)	4m 7s
Maven Verify (ubuntu-latest)	3m 4s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	-1s
	22m 23s

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