Add option to override the defaultDateFormat.

[maliming]

Developers should be able to customize the date format.
We can use the default date format from abp.localization.currentCulture.dateTimeFormat

abp/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared/wwwroot/libs/abp/aspnetcore-mvc-ui-theme-shared/bootstrap/dom-event-handlers.js

Lines 592 to 594 in 4ae705b

	var dateFormat = options.dateFormat;
	var separator = options.separator;
	var defaultDateFormat = extendDateFormat("YYYY-MM-DD", options);

https://uxsolutions.github.io/bootstrap-datepicker/?markup=range&format=yyyy-mm-dd&weekStart=&startDate=&endDate=&startView=0&minViewMode=0&maxViewMode=4&todayBtn=false&clearBtn=false&language=en&orientation=auto&multidate=&multidateSeparator=&keyboardNavigation=on&forceParse=on#sandbox

https://bootstrap-datepicker.readthedocs.io/en/latest/options.html#format

{
    "calendarAlgorithmType": "SolarCalendar",
    "dateTimeFormatLong": "dddd, MMMM d, yyyy",
    "shortDatePattern": "M/d/yyyy",
    "fullDateTimePattern": "dddd, MMMM d, yyyy h:mm:ss tt",
    "dateSeparator": "/",
    "shortTimePattern": "h:mm tt",
    "longTimePattern": "h:mm:ss tt"
}