Add an adversarial stress tester for the query service #1277
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The new nasty-client program runs a loop that generates a random workload for the sequencer query service. The workload is intended to be adversarial and do things that a realistic rollup client wouldn't do. The current workload specifically reproduces some behavior we've seen on Gibraltar, such as opening very old streams and keeping multiple streams open at once.
It should be easy to extend the client with new actions if we want to test additional behaviors.