fix: add keepalive to gRPC channel #49
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This patch adds keepalives to the GRPC channel every 2 minutes. By default, there are no keepalives to the GRPC channel. There have been issues observed with seeing DEADLINE_EXCEEDED errors at 10 minutes despite the timeout being longer eg 1 hour. Adding keepalives will hopefully address this. This fix has been added to the Java client for similar reasons.