GSP: spirit phantom, add in thermometry workflow

[arkiev]

Add in thermometry capability. See following links to get started:

• https://github.com/gold-standard-phantoms/ethylene-glycol-phantom-thermometry
• https://github.com/gold-standard-phantoms/mr-image-tools/blob/MIT-152-multiecho-thermometry-filter/src/mrimagetools/filters/multiecho_thermometry_filter.py