Support for Duration "part" methods

[MMauro94]

Hi, would it be possible to add the following methods to the Duration class:

• toDaysPart()
• toHoursPart()
• toMinutesPart()
• toSecondsPart()
• toNanosPart()

They should mimic the behavior of java.time.Duration (they extract the "part" information of the respective unit). Example:

const d = Duration.parse("PT1H30M20S"); //1 hour, 30 minutes, 20 seconds

d.toHours(); // 1
d.toHoursPart(); // 1

d.toMinutes(); // 90
d.toMinutesPart(); // 30

d.seconds(); // 5420
d.toSecondsPart(); // 20

[pithu]

Yes, since it is part of the threeten API we would accept pull requests for it.

[github-actions]

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