Implement fmtDuration using Formatter (#8137)

* Implement fmtDuration using Formatter

Deprecate Duration, duration

* fmtDuration: Fixed ns remainder

* fmtDuration: Fixed visibility; removed [Dd]uration
0447a2c041Jonathan Knezek committed on 3/7/2021, 1:00:15 PM· committed by GitHubparent72664df
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