Add a way to set SYS PATH using pybind

[Cesio137]

sys path is very useful when it comes to a virtual environment to add directories where modules installed by pip can be found. I found 3 ways to do this in the python documentation, if you can add this feature I would be grateful.

1. https://docs.python.org/3/c-api/sys.html?highlight=sys#c.PySys_SetPath
2. https://docs.python.org/3/c-api/init_config.html#c.PyConfig.module_search_paths
3. https://docs.python.org/3/c-api/init_config.html#c.PyConfig.module_search_paths_set