Ronald O. Perelman, the hard-charging billionaire businessman who became chairman of Carnegie Hall earlier this year, told his fellow board members on Thursday that he would step down next month because he had been frustrated that they had been slow to investigate his concerns about the governance of the hall, several people familiar with the proceedings said. Mr. Perelman had accused Carnegie’s well-respected executive and artistic director, Clive Gillinson, of a “troubling lack of transparency” and had criticized the board for failing to provide “appropriate oversight.”