The Celtics’ need to upgrade at the wing spot and their rumored interests show multiple ways to fill that role. As the Celtics jointly pursue playmaking and wing scoring additions that top their list of needs this summer, a fresh round of rumors ahead of Thursday’s free agency moratorium period show the multiple avenues they have to pursue those needs. Jake Fischer reported Boston has interest in Pacers free agent T.J. Warren and Hawks veteran Danilo Gallinari. Both players would provide immediate upgrades on the role Aaron Nesmith struggled to fill, spelling Jaylen Brown and Jayson Tatum while providing a…