[Feature Request] Write LAMMPS plugin

[njzjz]

Summary

Write a plugin for LAMMPS's new plugin system.

Detailed Description

Recently, in the development version of LAMMPS, a plugin package was published to load and unload several kind of styles in LAMMPS from shared object files at runtime without having to recompile and relink LAMMPS. It's the case of DP. We should support it to uncouple DP and LAMMPS, and give users more freedom.

Details can be found at the following links. It seems that we only need LAMMPS headers to build a LAMMPS plugin.

Further Information, Files, and Links

https://docs.lammps.org/Developer_plugins.html#writing-plugins
https://docs.lammps.org/plugin.html
https://github.com/lammps/lammps/tree/master/examples/plugins