Add concurrent batch writer + have browser feature support event use it #898
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This change adds a generic concurrent batch writer. This calls the BatchWriteMutations method from #889
Background: During testing in GCP, I saw that each batch write call has a limit but we can increase throughput by running concurrent batch writes.
By default, we set the batch size to 10000 entities and 8 concurrent batch writers. In the future, we can allow spanner clients to configure these based on system settings.