Boxohack fix

[just-oliver]

Changes

1. Addtion of arg and kwargs to reset method allowing BoxoHack.reset to accept the seed arguments provided by Gymnasium API.
2. Removed the possibility of method _is_episode_end ever calling while self._goal_pos_set is undefined, by initalizing as None during class init
3. FileNotFoundError chained to actual raised error ModuleNotFoundError to appease flake8
4. minihack/data directory defined directly rather than ambiguous minihack.dat definition
5. Test added to test the ability to reset these specific environments, ensures that the boxoban dataset levels are installed during test. shutil.rmtree cleans up if previously uninstalled after test runs. Test runs without issue.
6. Black commit requirement version changed from stable to 23.12.1. As most recent stable version of Black only is supported for Python >3.10.

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Closing issues

Closes #29.