Redevelopment is coming to some of New Jersey’s largest malls, as owners and local officials weigh plans to add apartments, health care facilities and vibrant public spaces meant to infuse them with new foot traffic. Proponents say the projects are essential to the long-term health of even the most successful assets. In other cases, they’re a potential lifeline to once-dominant shopping hubs that have become obsolete and seen their values plummet in recent years.