Support animated emotes which cant be compressed below 500KB

[gthvmt]

It seems like some animated emotes arent able to be compressed below 500KB (after upscaling).
One example for this is "vkusno".
Even if we encode the upscaled frames of this emote with a our minimum target size (1 byte) the output is still above 500KB.
One way to resolve this issue could be to remove every second frame of the animation. This should roughly be able to cut the filesize in half (I would assume?) and as that emote looks like it has a high framerate it shouldnt be too noticeable.