可否将插件从核心代码库中剥离出来？

如题，可否将插件从核心代码库中剥离出来？用户可以根据自身情况，决定引入哪些插件，比如我只需要做mysql的数据同步，那我引入mysql的读写插件即可。这样做还有一个好处，就是可以有官方维护的插件，也可以有社区维护的插件。而不必非得把插件的代码merge到核心项目中。

The issue proposes separating plugins from DataX's core so users can include only the connectors they need, such as MySQL read and write plugins. No files, tests, or entry points are named; begin by locating the current plugin and core-project structure, then define the separation and packaging approach for both official and community-maintained plugins.

Written by the indexing model from the issue text.