feat: model PostgreSQL extended statistics DDL #1041

Job	Run time
Grammar Choice Conflicts	26s
Gradle Check (windows-latest)	4m 39s
Gradle Check (ubuntu-latest)	3m 38s
Gradle Check (macos-latest)	2m 40s
Maven Verify (macos-latest)	4m 51s
Maven Verify (windows-latest)	4m 27s
Maven Verify (ubuntu-latest)	3m 24s
Gradle Publish (Maven Central)	0s
Build & Deploy Sphinx Docs	0s
	24m 5s

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