add "saf supplement tag" command

[ejaronne]

Develop "saf supplement tag -i <current-hdf-file.json> -m <existing-to-new_tag_mapping_file> -e <existing tag key name> -n <new tag key name> -o <output-hdf-file.json>" command to the SAF CLI to add tags based on existing tags within an HDF results file. The mapping file is a two-column csv or json. Header dictates the existing tag name and new tag name as keys for matching/adding.

(will follow-up with sample csv)