feat: schema changes to support SumType (#1322) #3305

Job	Run time
Rebuild All	2m 22s
Console	55s
VSCode Extension	44s
Test Kotlin	1m 28s
Lint	1m 10s
Proto Breaking Change Check	7s
SQL	37s
Test Go	3m 14s
Test README	2m 27s
Integration Tests / prepare	8s
Integration Tests / integration (TestLifecycle)	2m 29s
Integration Tests / integration (TestHttpIngress)	2m 14s
Integration Tests / integration (TestDatabase)	2m 20s
Integration Tests / integration (TestExternalCalls)	2m 21s
Integration Tests / integration (TestPubSub)	2m 25s
Integration Tests / integration (TestSchemaGenerate)	2m 22s
	27m 23s

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