brainglobe/brainglobe-registration

AI Summary: Refactor the `brainglobe_registration.utils.utils.py` file by moving the `calculate_rotated_bounding_box` function to `brainglobe_registration.utils.transforms.py` and reorganizing the remaining functions into more specific modules like `brainglobe_registration.utils.file.py` and `brainglobe_registration.utils.napari.py` for better code organization.