Searching for gifs and stickers

**Is your feature request related to a problem? Please describe.**

Currently, the app doesn't give anyway way to search for gifs and stickers in any instance. There are instances that have tons of gifs and stickers like Hexbear.

**Describe the solution you'd like**

A way to search for instances' gifs and stickers, as it is permitted in web.

**Describe alternatives you've considered**

Switch between to the web version to add the instances native stickers and gifs, and the app.

**Additional context**