Function validateCalendarDateTime

validateCalendarDateTime(date: CalendarDateTime): time.ValidationResult
Validate a complete CalendarDateTime object

Performs comprehensive validation on all components of a calendar date/time. Returns detailed error messages for any invalid components.
Parameters
- date: CalendarDateTime
  CalendarDateTime object to validate
Returns time.ValidationResult
ValidationResult with valid flag and array of error messages
Example
```
validateCalendarDateTime({
  year: 2024, month: 2, day: 29,
  hour: 12, minute: 30, second: 45
})
// { valid: true, errors: [] }
```
Example
```
validateCalendarDateTime({
  year: 2023, month: 2, day: 29,
  hour: 25, minute: 30, second: 45
})
// {
//   valid: false,
//   errors: [
//     'Invalid day: February 29 doesn't exist in 2023',
//     'Hour must be between 0 and 23, got 25'
//   ]
// }
```
- Defined in time/time-validation.ts:184