Support PostgreSQL CREATE and ALTER COLLATION #1075

Job	Run time
Gradle Check (windows-latest)	4m 41s
Gradle Check (macos-latest)	3m 3s
Grammar Choice Conflicts	30s
Gradle Check (ubuntu-latest)	3m 21s
Maven Verify (windows-latest)	2m 51s
Maven Verify (macos-latest)	4m 53s
Maven Verify (ubuntu-latest)	2m 59s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	22m 18s

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