add tail function for debugging #131
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this allows a debugger to connect to a node and see what's being written to a topic. it's automatically limited in terms of how long it can run and how many records it can receive, and gets directly sent messages as late as possible to avoid blocking the write path if possible.
Since message sends are direct, backpressure is provided by limiting the printing pid to ~1MB of heap, and monitoring it from the active segment.
cc @varnerac
more #100