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Separate index and constraint ASTs (breaking API change) #1133

Job	Run time
Gradle Check (windows-latest)	4m 27s
Gradle Check (ubuntu-latest)	3m 38s
Gradle Check (macos-latest)	4m 15s
Grammar Choice Conflicts	22s
Maven Verify (ubuntu-latest)	3m 59s
Maven Verify (windows-latest)	4m 50s
Maven Verify (macos-latest)	5m 58s
Build & Deploy Sphinx Docs	-1s
Gradle Publish (Maven Central)	-1s
	27m 27s