[Feature] DaysOfweekStyle supports daysOfWeekStyleBuilder

[GeekTree0101]

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Some calendar services mark Saturday in blue and Sunday in red. So I suggest adding DaysOfWeekStyleBuilder to the DaysOfWeekStyle class

Usecase

daysOfWeekStyle: DaysOfWeekStyle(
  daysOfWeekStyleBuilder: (context, day) {
    if (day.weekday == DateTime.sunday) {
      return TextStyle(
        fontWeight: FontWeight.bold,
        color:  Colors.red,
      );
    } else if (day.weekday == DateTime.saturday) {
      return TextStyle(
        fontWeight: FontWeight.bold,
        color: Colors.blue,
      );
    } else {
      return TextStyle(
        fontWeight: FontWeight.bold,
        color: Colors.grey,
      );
    }
  },
)

Screenshot