Attach uvloop to a running libuv event loop

还没有人认领这个 Issue。

I am interested in uvloop for the following use case:

- I have a C++ application running libuv, embedding a Python interpreter running in the main thread
- I would like to use asyncio in the Python interpreter so that it uses the libuv event loop at hand, and does not block the main application.

Does uvloop's provide means to **attach the Python wrapper to an existing libuv event loop**? If it is a simple addition, would you consider such a feature - or accept a contribution enabling this use case ? (pointers welcome on where to get started).

首先检查 uvloop 现有的 asyncio 事件循环入口，以及 Python 解释器当前如何到达 libuv；issue 未指定文件或测试。确定是否支持连接到一个在外部运行的 libuv 循环，或者需要怎样的 API 设计，然后记录具体的贡献路径和完成标准。

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