evas/cserve2: Fallback to normal cache for animated gifs

evas/cserve2: Fallback to normal cache for animated gifs

Pass around "animated" flag for images that can be animated.
Fallback to local cache if the image is animated.
Implementing support for animated images in cserve2 does
not seem to make a lot of sense considering each frame must
be requested independently in real time,... and to be honest
there doesn't seem to be any valid use case anyway :)