Added PG support for vector indexes #8508

Job	Run time
Checkstyle	1m 55s
Spotless	1m 53s
Build	2m 45s
Unit Tests	8m 18s
Dataflow Templates Integration Smoke Tests	7m 4s
Dataflow Templates Integration Tests	2h 6m 42s
Dataflow Templates Load Tests	0s
	2h 28m 37s

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