Can't edit a date cell if grid's data is of ISO String or Numeric types

 * igniteui-angular version: 10.0.x
## Steps to reproduce  

1. Go to gridCellEditing dev sample
2. Edit first date value in the data source:
    OrderDate: new Date('2012-02-12').toISOString()
3. Double click the first cell in the OrderDate column to enter edit mode

## Result  
An error is thrown in the console

## Expected result  
Be able to succesfully edit the cell.
