MedMen, a management company that provides services to the legal cannabis industry, has launched a $100 million private equity fund. The Los Angeles-based firm said its MedMen Opportunity Fund L.P. will pursue strategic investments in supply-constrained, high-barrier to entry markets and be diversified on both an asset and geographic basis. It also will own a portion of MedMen’s management company, which will serve as the fund's captive operating partner, providing resources and operational oversight…