Add custom_frame_set_path to eiger2crysalis

The goal is to add custom_frame_set_path input to: https://gitlab.esrf.fr/workflow/ewoksapps/ewoksscxrd/-/blob/main/src/ewoksscxrd/tasks/eiger2crysalis.py?ref_type=heads

If provided, check if the file exist, raise if not. If file exists, use shutil to copy it as frame.set in the output folder.