[Feature request] Disable rounding in `dayjs.duration().humanize()`

Hi,

It would be nice to have an option for `{ seconds: 10 }` to output `10 seconds` rather than `a few seconds`, and more importantly, for `{ minutes: 45 }` to output `45 minutes` rather than `an hour`.

Thanks

Start at the dayjs.duration().humanize() entry point and inspect how its current rounding behavior is implemented. Define the option's expected behavior from the examples: 10 seconds should remain “10 seconds” and 45 minutes should remain “45 minutes,” while existing output should remain unchanged when the option is not used.

Written by the indexing model from the issue text.