Make a new set of topology graphs which use other construction libraries

[lukasturcani]

Probably make a new repository / python package stk-autgrafs or add an optional dependency

https://github.com/DCoupry/autografs

The topology graphs will not use the default implementation of construct() but instead have an implementation that just
calls autografs internally

This idea can be re-used for all sorts of other molecular - construction packages providing easy integration and structures for our users