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for some reason putting it in LM and having it be inherited breaks
everything. should try to figure this out at some point.

model_args should only be things that affect output of the model
therefore, stuff like batch size, device, etc shouldn't be in there

- Extract evaluator (still needs work to clean up)
- Add tests for evaluator
- Fix all the things that break on the new tests
- Misc cleanup

This should allow the user to only do the first few eval tasks.