[MERGE] first round of use case benchmarks

[Carl Friedrich Bolz]

Hi all!

We updated the merge request (see attachment) for use case benchmarks to
also include lower level bundle benchmarks (so far reading and writing
only). We also implemented a caching mechanism, which caches trees
across test runs in ~/.bazaar/devtemp. This is meant for developers only
and is disabled by default.

Cheers,

Carl Friedrich
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