微信支付 APP统一下单接口v3，缺少sign参数

[evanweng666]

简要描述

微信支付 APP统一下单接口v3，缺少sign参数

模块版本情况

• WxJava 模块名: weixin-java-pay
• WxJava 版本号: 4.1.0

详细描述

WxPayUnifiedOrderV3Result.getPayInfo构建APP支付信息时没有签名
官方文档：https://pay.weixin.qq.com/wiki/doc/apiv3/apis/chapter3_2_4.shtml
签名示例：SignUtils.sign(String.format("%s\n%s\n%s\n%s\n", appid, timestamp, noncestr, prepayid), wxPayService.getConfig().getPrivateKey())

[stale]

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