feat: support PostgreSQL ALTER SCHEMA actions #942

Job	Run time
Gradle Check (macos-latest)	3m 56s
Grammar Choice Conflicts	32s
Gradle Check (windows-latest)	4m 31s
Gradle Check (ubuntu-latest)	3m 33s
Maven Verify (windows-latest)	2m 43s
Maven Verify (ubuntu-latest)	2m 11s
Maven Verify (macos-latest)	4m 30s
Build & Deploy Sphinx Docs	-1s
Gradle Publish (Maven Central)	-1s
	21m 54s

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