Function date_range 

pub fn date_range(
    name: PlSmallStr,
    start: NaiveDateTime,
    end: NaiveDateTime,
    interval: Duration,
    closed: ClosedWindow,
    tu: TimeUnit,
    tz: Option<&Tz>,
) -> PolarsResult<DatetimeChunked>

Create a DatetimeChunked from a given start and end date and a given interval.