Support typed transaction starts, chaining and savepoint release #1102

Job	Run time
Grammar Choice Conflicts	32s
Gradle Check (windows-latest)	4m 49s
Gradle Check (ubuntu-latest)	3m 47s
Gradle Check (macos-latest)	3m 28s
Maven Verify (macos-latest)	5m 12s
Maven Verify (ubuntu-latest)	4m 40s
Maven Verify (windows-latest)	4m 38s
Gradle Publish (Maven Central)	0s
Build & Deploy Sphinx Docs	0s
	27m 6s

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