[benchmark] Extract setup from DataBenchmarks
[benchmark] Extract setup from DataBenchmarks

DataCount had setup overhead of 18 μs (20%).
DataSubscript had setup overhead of 18 μs (2%).
SetUpFunction wasn’t necessary, because of short initialization (18 μs for `sampleData(.medium)`), which will inflate only the initial measurement.

Runtimes of other benchmarks hide the sampleData initialization in their artificially high runtimes — most use internal multiplier of 10 000 iterations — but were changed to use the same constant data, since it was already available. The overhead will already be extracted if we go for more precise measurement with lower multipliers in the future.

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