Automatization idea: find duplicated constants

Context: https://github.com/python/typeshed/pull/7065

Sometimes python / stubs do re-export constans from other modules.
In this case we can:

1. Use re-export as well (correct option)
2. Duplicate these constants (ok-ish, but not great)

Right now we do nothing to detect the second case.
I guess, that we can improve this!

We can write some kind of non-blocking helper who searches related modules for constants with the same names and suggests to re-use them if needed.

从 python/typeshed 的 pull request 7065 中的上下文开始，审查相关模块如何重新导出常量。然后确定一个非阻塞 helper 的范围，该 helper 用于查找重复的常量名称并建议复用；当方法和预期行为定义得足够明确、可以进行实现时，即视为完成。