Add (try_)from_secs_f64, (try_)from_millis_f64, as_millis_f64 and as_secs_f64 to TimeDelta #1601
Description
This allows converting a floating point representation of millis/secs into durations, just like std::time::Duration has.
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This allows converting a floating point representation of millis/secs into durations, just like std::time::Duration has.