WIC 定义从可继承仓库里读取的逻辑

[lindexi]

如果读取不到值，就从继承的仓库进行读取。适合用来做配置插件开发

然而实际上配置插件也有其他实现方式，因此这里只是做 API 定义，讨论之后，如果觉得需要加上再说

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}