提供一个client包装类，便于用户在补充SDK内未提供接口时可以轻松地集成client的原生接口

[GeTOUO]

现在，用户可以继承ClientWrapper并根据自己的需要补充SDK内尚未提供的接口调用。

    class MyClient extends ClientWrapper {

        public MyClient(Client client) {
            super(client);
        }

        // 补充SDK尚未封装的接口: 小程序登录。
        public String appletAuthenticateCode2Session(String code) {
            Map<String, String> body = new HashMap<>(1);
            body.put("code", code);
            this._getClient().post("https://open.feishu.cn/open-apis/mina/v2/tokenLoginValidate", body, AccessTokenType.App);
            // handle response ...
            return access_token;
        }
    }

像这样使用：

MyClient client = new MyClient(Client.newBuilder(id, key).build());

String accessToken = client.appletAuthenticateCode2Session("code");

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