Add date tests to validation rules

[ashleynolan]

A rule for dates testing dates should be added to the validation checks.

Typical use case:

name: 'dateInFuture',
 test: () => {
     const dateToday = new Date();
     const currentMonth = dateToday.getMonth() + 1;
     const currentYear = dateToday.getFullYear();
     const selectedMonth = Number($.first('[id="ExpiryMonth"]').value);
     const selectedYear = Number($.first('[id="ExpiryYear"]').value);
     if (selectedYear > currentYear) {
         return true;
     }
     return selectedYear === currentYear && selectedMonth > currentMonth;
 }