Re-export Time in icu::calendar?

[sffc]

There is icu::calendar::Date and icu::calendar::DateTime but not icu::calendar::Time.

We do have a Time type but it is in icu::calendar::types::Time which is much less discoverable.

I think we should re-export Time.

CC @Manishearth

[Manishearth]

I am weakly in favor of this.

[sffc]

For me, Time is clearly in a higher tier than the other things in types like Hour, IsoYear, etc.

Two pieces of evidence:

1. Temporal defines the following top level types, which includes Time:
   • PlainDate
   • PlainDateTime
   • PlainTime
   • ZonedDateTime
   • PlainMonthDay
   • PlainYearMonth
2. We also have both a DateFormatter and a TimeFormatter.

[sffc]

@zbraniecki Do you agree?

[zbraniecki]

sure!