Image Gallery with responsive Masonry Grid

# Feature Request

## Is your feature request related to a problem? Please describe

I'd like to create responsive Image Galleries with Masonry Grids, because often I have Photos in Landscape AND Portrait mode and I really like the Masonry Style to showcase them.

## Describe the solution you'd like

I wish, bootstrap package had a Content Element for Image Galleries with the Option to show the Thumbnails in a Masonry Grid.

I'd love it, if such a CE could be integrated in Bootstrap Package. In BS4 it could be realized with Card Columns, but in BS5 it's not included anymore and the recommend to use the masonry plugin: https://masonry.desandro.com/

## Describe alternatives you've considered

My only alternative so far would be to create an own CE and create an own template for a Masonry grid an include all dependecies like js and css.

## Additional context

BS5: https://getbootstrap.com/docs/5.0/components/card/#masonry
BS4: https://getbootstrap.com/docs/4.6/components/card/#card-columns

The issue names no implementation files or tests; start by locating the Bootstrap Package's existing image-gallery or image content-element structure and review the linked Bootstrap 5 masonry guidance. Define the responsive thumbnail behavior, configuration, and dependency approach before implementation; done means the package provides an integrated masonry gallery content element.

Written by the indexing model from the issue text.