Anonymisation script generator

Currently, we have several manually-created anonymisation scripts in this repo [here](https://github.com/GSTT-CSC/XNAT/tree/main/xnat-csc/helpers) (based on XNAT official guidance [here](https://wiki.xnat.org/documentation/how-to-use-xnat/image-session-upload-methods-in-xnat/how-to-write-an-anonymization-script)). Since different projects may require different combinations of tags to be anonymised, and potentially specific anonymisation requirements per tag, it would be helpful to have a script that can produce this based on an input file e.g., required deanonymised tags.