Add print_output parameter to allow real time monitoring #30
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This addresses something similar to #19.
The current behavior is that if return_output is True, nothing is printed to stdout as replication is occurring. Instead, the logs are returned once at the end.
return_output is True in the Dagster integration, so there is no progress written to stdout until the replication finishes. If something is taking a long time, we have no visibility into what step it is on.
With this PR, if return_output and print_output are both true, we will be able to see sling's progress in stdout in real time.
The if / else statements are a bit counterintuitive (e.g. if return_output and print_output are both false, it still prints), but I wrote it that way to make sure existing behavior doesn't change unless someone uses the new parameter intentionally.