fix(metrics): use monotonic System.nanoTime and ignore non-positive durations (fixes #3480) - #4100

fix(metrics): use monotonic System.nanoTime and ignore non-positive durations (fixes #3480)#4100

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wavesplatform:version-1.6.xwavesplatform/Waves:version-1.6.xfrom

D-H-O-R-A:fix/kamon-timer-monotonic-ntp-skewD-H-O-R-A/Waves:fix/kamon-timer-monotonic-ntp-skewCopy head branch name to clipboard