🐛 Bug description

• A typo in docstrings. 0.4.10 or 0.5.0?
• _run_once_on_dataset_as_gen is restarted (because it is called) whenever we get into _internal_run_as_gen
• Some statements before _run_once_on_dataset_as_gen should be skipped on resume and some other after that should be skipped on interrupt
• Once running after a terminated state, _run_once_on_dataset_as_gen should be set to None before entering _internal_run.
• If engine was interrupted in the middle of the last epoch, is_done incorrectly returns True on resume thus preventing it.
• _run_once_on_dataset_as_gen yields the state on interrupt, not the time, so this shoud be changed.
• Since _run_once_on_dataset_as_gen has both return value and yield value with different types, its annotation could be updated to reflect this e.g. become Generator[State, None, float]