feat: refactor types (#123)

* Refactor types

* Delete old experimental code

* Refactor datasets

* Improve dataset split parsing; update make_dataset types

* Update preprocessed datasets save dir

* refactor: delete duplicated files

* Fix pyright errors

* Fix tests

* Fix lint

* chore: re-add tqa raw datasets

* feat: add tests for evaluators

* feat: re-add caa-style prompt

* chore: delete unused code

* refactor: migrate SteeringHook to repepo.core

* test: assert pos, neg prompts the same

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Co-authored-by: Daniel CH Tan <dtch1997@users.noreply.github.com>