Feature Request: Provide new class variables for CN format too in Lunar Class

[sgon00]

First, Thank you very much for this project.

Can you please provide new class variables for CN format too in Lunar Class?
I am not sure what variable names you like. I use the following modified code for now:

class Lunar {
  String get lunarYearCN {
    int year = lunarYear;
    if (year < 0) {
      //确保能读到正确的天干地支数据
      year++;
    }
    if (year < 1900) {
      //把远古年代转到近代来计算天干地支
      year += ((2018 - year) / 60).floor() * 60;
    }
    int absYear = lunarYear.abs();
    String prefix = (lunarYear < 0 ? "公元前" : "") + "$absYear";
    return ((_tiangan[(year - 4) % _tiangan.length]) + (_dizhi[(year - 4) % _dizhi.length]) + "年");
  }

  String get lunarMonthCN {
    if (lunarMonth < 1 || lunarMonth > 12) {
      return "非法日期";
    }
    String month = _lunarMonthList[lunarMonth - 1];
    String leap = isLeap ? "闰" : "";
    return "$leap$month月";
  }

  String get lunarDayCN {
    if (lunarDay < 1 || lunarDay > 30) {
      return "非法日期";
    }
    return _lunarDayList[lunarDay - 1];
  }
}

Thanks a lot.