feat: model PostgreSQL extended statistics DDL #1053

Job	Run time
Gradle Check (ubuntu-latest)	3m 50s
Gradle Check (windows-latest)	4m 44s
Gradle Check (macos-latest)	3m 47s
Grammar Choice Conflicts	28s
Maven Verify (ubuntu-latest)	3m 37s
Maven Verify (windows-latest)	4m 28s
Maven Verify (macos-latest)	5m 6s
Gradle Publish (Maven Central)	-1s
Build & Deploy Sphinx Docs	-1s
	25m 58s

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