test(spanner/spannertest): migrate most test code to integration_test…

….go (#2977) This makes it much easier to execute the same tests against both spannertest and a real Spanner database, which has surfaced a few divergences (noted with TODOs). This also exercises more of the Spanner client library's interaction with spannertest, ensuring better coverage of inmem.go too.
googleapis · Oct 7, 2020 · e88f9dd · e88f9dd
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commit e88f9dd
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diff --git a/spanner/go.mod b/spanner/go.mod
@@ -13,4 +13,5 @@ require (
 	google.golang.org/api v0.32.0
 	google.golang.org/genproto v0.0.0-20201006033701-bcad7cf615f2
 	google.golang.org/grpc v1.32.0
+	google.golang.org/protobuf v1.25.0
 )