feat(core): Min-max versions of histogram quantile and fraction for exp histograms

[vishramachandran]

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• Tests for the changes have been added (for bug fixes / features) ?
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Use min and max when available to calculate better quantiles and fractions.

Updated perf test results for quantiles with exponential histograms are shown below. There is a proportional degradation of performance as the number of buckets increase. Thus, exponential histograms will benefit from pre-aggregation when a large number of time series is involved. Note these results supersede the results in earlier exponential histogram PR.

32 buckets without profiling
[info] Benchmark                                                          Mode  Cnt    Score   Error  Units
[info] Base2ExponentialHistogramQueryBenchmark.histQuantileRangeQueries  thrpt    2  404.993          ops/s

64 buckets without profiling
[info] Benchmark                                                          Mode  Cnt    Score   Error  Units
[info] Base2ExponentialHistogramQueryBenchmark.histQuantileRangeQueries  thrpt    2  252.478          ops/s

128 buckets without profiling
[info] Benchmark                                                          Mode  Cnt    Score   Error  Units
[info] Base2ExponentialHistogramQueryBenchmark.histQuantileRangeQueries  thrpt    2  234.001          ops/s

160 buckets without profiling
[info] Benchmark                                                          Mode  Cnt    Score   Error  Units
[info] Base2ExponentialHistogramQueryBenchmark.histQuantileRangeQueries  thrpt    2  219.758          ops/s

200 buckets without profiling
[info] Benchmark                                                          Mode  Cnt    Score   Error  Units
[info] Base2ExponentialHistogramQueryBenchmark.histQuantileRangeQueries  thrpt    2  137.804          ops/s

256 buckets without profiling
[info] Benchmark                                                          Mode  Cnt    Score   Error  Units
[info] Base2ExponentialHistogramQueryBenchmark.histQuantileRangeQueries  thrpt    2  119.017          ops/s

Fitted Linear Regression:

JMH Benchamark CPU Profile

[sandeep6189]

thank you for adding unit test @vishramachandran