the `RefinementEngine` and `config` are ROCKET-specific and need to be generalized

[tjlane]

Proposal: make RefinementEngine and the associated LLM'd code abstract.

RefinementEngine is simply a logging device for refinement. It should log things that will be common to all refinement type work: structures, compute metrics, etc. Specific refinement implementations (e.g. ROCKET). will subclass or append metadata that makes sense for their specific application.

@alisiafadini I will request your help to see what can be deleted.