Update Bounds class

Bounds is useful outside of nshmp-lib

• Add public factory method
• Limit creation to (minLat, minLon, maxLat, maxLon)
• Update tests

added Enhancement Unplanned labels

mentioned in merge request nshmp-haz!640 (merged)

mentioned in merge request !279 (merged)

mentioned in commit ca48be2b

closed with merge request !279 (merged)