Support typed transaction starts, chaining and savepoint release #1092

Job	Run time
Grammar Choice Conflicts	26s
Gradle Check (windows-latest)	4m 45s
Gradle Check (macos-latest)	4m 31s
Gradle Check (ubuntu-latest)	3m 54s
Maven Verify (ubuntu-latest)	3m 48s
Maven Verify (macos-latest)	5m 43s
Maven Verify (windows-latest)	4m 54s
Gradle Publish (Maven Central)	-1s
Build & Deploy Sphinx Docs	-1s
	27m 59s

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