Add a transaction benchmark using a naïve unscalable leftist heap - #196
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This PR adds another benchmark that stresses the transaction mechanism. The benchmark is based on a naïve leftist heap data structure. The problem with that is that every operation modifies the root. That is a fundamental sequential bottleneck and it means that the data structure simply cannot scale to multiple cores such that thruput would improve by adding workers. Nevertheless this could be a useful benchmark of the transaction mechanism.