Create a Media Gallery component

In many participation processes that I deal with, it could be really useful to have a nice and user friendly media gallery space, to share in a single place images and videos realated to a process. Since we don't have this tool usually we adapt different components: example

The "visual empowerment", especially today, it's very useful to create engagement into the citizens, and many times it needs to link to social networks to share with participants rich media galleries. Think about processes where the citizens are involved to retrain a space or a whole neighborhood: it's really important to provide a visual documentation of the environment at the starting point.

Decidim should provide its own Media gallery component, with the necessary features to organize in a single page pictures and videos in a user friendly way: for example grid display, slideshow tool, search bar.