image/gif: make Decode only keep the first frame in memory

image/gif: make Decode only keep the first frame in memory

Decode decodes entire GIF image and returns the first frame as an
image.Image. There's no need for it to keep every decoded frame in
memory except for the one it returns.

Fixes #22199

Change-Id: I76b4bd31608ebc76a1a3df02e85c20eb80df7877
Reviewed-on: https://go-review.googlesource.com/69890
Reviewed-by: Nigel Tao <nigeltao@golang.org>