发送群聊图片

{
    "group_id": 379450326,
    "message": [
        {
            "type": "image",
            "data": {
                // 本地路径
                "file": "file://D:/a.jpg"
                
                // 网络路径
                // "file": "http://i0.hdslb.com/bfs/archive/c8fd97a40bf79f03e7b76cbc87236f612caef7b2.png"
                
                //base64编码
                // "file:": "base64://xxxxxxxx"
            }
        }
    ]
}