test(ivy): fined tune micro benchmark parameters

[mhevery]

Decrease MIN_SAMPLE_DURATION to make it more likely that we cane fit into single time slice.
Increase MIN_SAMPLE_COUNT_NO_IMPROVEMENT to make it more likely to find the best

[shedinnmarble]

How do you prove that your number change has performance improvement? what's the difference?

[mhevery]

How do you prove that your number change has performance improvement? what's the difference?

this is what we used for perf testing. We run the same benchmark over and see if the variation in results improves.

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