feat: 新增 v3 付款码服务商模式

[majiameng]

经过您的指导，我安装了v3.6版本来使用微信服务商v2付款码，偶然间翻微信文档找到了微信服务商v3付款码支付。

普通商户付款码支付V3接口文档地址：
付款码支付：
https://pay.weixin.qq.com/docs/merchant/apis/code-payment-v3/direct/code-pay.html
撤销订单：
https://pay.weixin.qq.com/docs/merchant/apis/code-payment-v3/direct/reverse.html

服务商模式付款码支付V3接口文档地址：
服务商付款码支付：
https://pay.weixin.qq.com/docs/partner/apis/partner-code-payment-v3/partner/partner-code-pay.html
服务商付款码支付撤销订单：
https://pay.weixin.qq.com/docs/partner/apis/partner-code-payment-v3/partner/partner-reverse.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.49%. Comparing base (da3bf50) to head (c82e71b).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1010   +/-   ##
=========================================
  Coverage     97.49%   97.49%           
- Complexity      952      957    +5     
=========================================
  Files           361      361           
  Lines          6456     6479   +23     
=========================================
+ Hits           6294     6317   +23     
  Misses          162      162           

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