小程序增加图像处理相关接口

[binarywang]

https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/img/img.aiCrop.html

https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/img/img.scanQRCode.html

https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/img/img.superresolution.html

[binarywang]

跟公众号相关接口是相同的，需抽象接口，统一实现