[benchmarking-cli] Add --keys-limit=Option<usize> and --random-seed=Option<u64>
#10884
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Description
This PR adds two optional new params to the
benchmarkcli subcommand:1 -
--keys-limit=N: Limits the number of keys processed during read and write benchmarks.2 -
--random-seed=M: Provides deterministic randomness for benchmark reproducibility by seeding the random number generator used for key shuffling.The motivation here is that dealing with huge storage (multiple terabytes) the benchmark workflow could easily eat all the target machine resources, making it impossible (or very expensive) to complete.