More styling options for the comments widget

## Prerequisites
- [x] I have searched for similar features requests in both open and closed tickets and cannot find a duplicate.
- [x] The feature is still missing in the latest stable version of Elementor ( Elementor Pro. )

Hi!
We recently used the comment widget on the single post template.
There are no styling options for this widget.
It would be easier if we could style the Title in the widget and input field and button.

Thanks