Allow for parallelism configuration in BatchedSender #681
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As it stands, the degree of parallelism in the action block responsible for sending batch messages to the underlying transports is capped at "1". This means only a single batch request can be in flight at any given time. By allowing the degree of parallelism in this action block to be configurable, we can push a significantly higher degree of throughput to the underlying transport in at least some cases.