Add 2D field plotter and parameter reduction operators

1. Add a 2D field plotter operator (hysop/operator/plotters.py)
2. Add a parameter reduction operator, currently supports min, max and sum (hysop/operator/reductions.py)

assigned to @keckj

approved this merge request

enabled an automatic merge when the pipeline for 8ae64999 succeeds

unapproved this merge request

canceled the automatic merge

added 1 commit

• 293a22af - Quick fix

Compare with previous version

approved this merge request

enabled an automatic merge when the pipeline for 293a22af succeeds

changed the description

merged

mentioned in commit ac4e89bf