MephistoCalendarPicker constructor 
    
      const
      MephistoCalendarPicker({ - Key? key, 
 
- bool? isRangeSelectionCalendar = true, 
 
- Color? color, 
 
- int? calendarFormat = 0, 
 
- Function? onEventTap, 
 
- Function? onSelect, 
 
- Function? onRangeSelect, 
 
- DateTime? initialDate, 
 
- DateTime? startDate, 
 
- DateTime? endDate, 
 
})
    
    
    
  Implementation
  const MephistoCalendarPicker(
    {super.key,
    this.showHeader = true,
    this.isRangeSelectionCalendar = true,
    this.color,
    this.calendarFormat = 0,
    this.onEventTap,
    this.onSelect,
    this.onRangeSelect,
    this.initialDate,
    this.startDate,
    this.endDate});