Make repeatable quantile results for repeatable input sequency to Fas…

…t.Update()

See VictoriaMetrics/VictoriaMetrics#1612

vendor: run `go mod vendor`

Free up samples memory occupied by unused histograms

This should reduce memory usage when big number of histograms are used
and only a small fraction of these histograms are updated, while others
are periodically reset like in github.com/VictoriaMetrics/metrics

Free up samples memory occupied by unused histograms

This should reduce memory usage when big number of histograms are used
and only a small fraction of these histograms are updated, while others
are periodically reset like in github.com/VictoriaMetrics/metrics

Rename New -> NewFast

Initial release