Adapt to the latest BrokerApi interface Implement three methods added to the `BrokerApi` interface on `master` and fix compilation errors. The added methods allow managing the subscriptions by adding the `groupId` parameter. Bug: Issue 327699479 Change-Id: If3e4bd131bfd492d5e452b9989ac8d975991293e
Gerrit event producer and consumer for GCloud PubSub
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