public GenericRequestBuilder<ModelType, InputStream, GifDrawable, byte[]> toBytes() {
        return transcode(new GifDrawableBytesTranscoder(), byte[].class);
    }
Setup the request to return the bytes of the loaded gif.
<p>
    Note - Any transformations added during this load do not change the underlying bytes and therefore this
    will always load and provide the bytes of the original image before any transformations to the given target.
</p>

@return A new Builder object to build a request to transform the given model into the bytes of an animated gif.
core/src/main/java/com/bumptech/glide/GifTypeRequest.java