Add PluginAPI.h for APIs related to the plugin

[futrime]

Is your feature request related to a problem? Please describe.

Currently the plugins are just treated as dynamic linked libraries. However, I hope that the plugins can be managed like the packages of NodeJS or Python.

Describe the solution you'd like

1. Move the plugin registration APIs to PluginAPI
2. Add dependency system
3. Add configuration helper
4. Add data helper
5. Add file helper
6. Add log helper