The ownership group planning to buy Columbus Crew SC is committing to make major investments in the team and the city. A big part of that commitment was unveiled Thursday with plans for a new $230 million stadium in the Arena District, anchoring a larger mixed-use development in the far west part of the neighborhood. A plan for a new stadium was a condition to finalizing a deal for Major League Soccer and Crew SC operator/owner Precourt Sports Ventures to sell the team to Cleveland Browns owners…