In New Jersey, you need a special license to become a plumber. Or a lawyer, hairdresser or bus driver. But unlike most other states, there’s no licensing system for police. Gov. Phil Murphy today announced plans to create one, endorsing proposed legislation that would empower the state Police Training Commission to create licensing requirements for cops, as well as a decertification process for officers who run afoul of the law. “Policing is perhaps the only skilled profession left in New Jersey that does not provide individuals with a license that shows beyond any doubt that they have been th…