[Feature Request] Add post count to filter in portfolio elements

## 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. )

**What problem is your feature request going to solve? Please describe.**
Letting the visitor know how many portfolios are within one category.

**Describe the solution you'd like**
A simple number behind the filterable category in brackets, like (16)

**Additional context**
It's the same counter as the standard Wordpress tag cloud widget has.