The trajectory of the new musical Two Strangers (Carry a Cake Across New York) seems straight out of a movie. The musical, from an unknown team, first premiered in 2019 in the small town of Ipswich in the U.K. before transferring to London and becoming a West End sleeper hit. It then flew across the Atlantic to Cambridge's American Repertory Theatre. And now, seven years after conception, Two Strangers has finally la…