Saving .JSON file (with interactive updates) for each segmentation masks files.

[maxradx]

Is your feature request related to a problem? Please describe.
Proposed by @jcohenadad in previous review (PR 105)
Instead of saving a .csv file containing the segmentation masks metadata, a .JSON file could be saved (which is BIDS compatible)

Describe the solution you'd like
While CSV files offer an interesting tabular format for further statistical analyses, .JSON files that are BIDS compatibles could be added when saving segmentation files to facilitate metadata incorporation and management from segmentation files. Both could also be saved, because those files may serve for different purposes.

Describe alternatives you've considered
Adding in the Configuration UI the option to save a .CSV file, .JSON file or both
For example, an option could be added in this GUI: