Miss `size` property in `Image` and `Media` Class

[wuseal]

While the json returned from server has a property called size: But in tenor-android-core SDK there can't get this property value form Image nor Media Class

public class Image implements Serializable {
    private static final long serialVersionUID = -8616498739266612929L;
    private String url;

    @SerializedName("dims")
    private int[] dimensions;

    ...
}

public class Media extends Image {
    private static final long serialVersionUID = -8616498739266612929L;
    private String preview;
    private double duration;

    ...
}

We need to get this value for some logic usage, hope to add it. thanks