wetrun testing

[jordandekraker]

Currently, I have pulled some opensource data: https://osf.io/k2nme/ and Doc here: #303

TODO:

• ideally, we should make all of these wetrun data into a snakemake workflow and automate
• ideally outputs will be kept to avoid re-running (and updated when a PR is merged) (i.e. hippunfold_outputs_version-latest on OSF) (maybe revisit with zenodo?)
• add some metrics to compare hippunfold version (or between commits)
• surface-surface differences
• subfields volume difference
• table of failed cases (e.g. >5mm difference)
• plot and view differences
• add workflow for automatically running this comparison (maybe snake-batch?)