graphics/upscaler: add new port

Upscaler is a GTK4 + libadwaita application that allows you to upscale
and enhance a given image. It is a front-end for Real-ESRGAN ncnn Vulkan.

https://gitlab.com/TheEvilSkeleton/Upscaler
(cherry picked from commit 4b15a96231c6a389a6080127d3f9a7fcedbf9315)