feat(pubsub): expose CallOptions for pub/sub retries and timeouts #4428
+193
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In a similar vein to the spanner PR (#2599), this PR allows users to specify their own retry / timeout configurations for clients for the high level manual library. Default topic/subscription configs are configured in all the GAPIC libraries and are exposed there (
cloud.google.com/go/pubsub/apiv1
), but currently cannot be configured in the handwritten/manual library. This differs from the Spanner PR in that Pub/Sub requires specifying the publisher and subscriber options separately, requiring separate helper functions. Otherwise these functions are functionally identical to spanner.Closes #4162