Currently the PravegaReader uses the streaming API to read the stream however for Historical read testing we also need to test with the BatchClient.

Proposal
Add an extra -batchreader option, that if specified, tells the reader to consume the stream with the BatchClient. The number of consumers will still be specified and the reader will allocate the segments provided by the BatchClient to the available consumers.

Latency and Throughput metrics would be recorded as they would for any test using the streaming reader.