Refactor schemas and runners into classes

[Andrew-S-Rosen]

What would you like to report?

There is a fair bit too much copy/paste around for my liking. The best place to start tackling this is to refactor some of the quacc.schemas to inherit from common base classes and use an object-oriented approach. There is also the possibility of doing this for other modules (e.g. quacc.runners is an ideal place).