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+bigquery(), google-pubsub-grpc(): Added service-account() authentication option.
+
+Example usage:
+```
+destination {
+    google-pubsub-grpc(
+        project("test")
+        topic("test")
+        auth(service-account(key ("path_to_service_account_key.json")))
+    );
+};
+```
+
+Note: In contrary to the `http()` destination's similar option,
+we do not need to manually set the audience here as it is
+automatically recognized by the underlying gRPC API.