Add support for DateTime widget

[lfasani]

• I have checked that this feature has not yet been suggested by someone else.

Sirius need a widget to display a date and a time

Expected behavior

A new DateTime form widget will be created.
It will be compliant to any generic behavior of a form widget.

Specifier must be able to define to add a widget of type dateTime in the view model and also in the Form WYSIWYG editor.