This Rhode Island theater merits praise for its courage in staging dramatist Sarah Kane’s highly unorthodox portrayal of severe depression. 4:48 Psychosis by Sarah Kane. Directed by Tony Estrella. Presented by The Gamm Theatre, Pawtucket, RI, through February 7. Reviewed By Caldwell Titcomb The Gamm Theatre in Pawtucket merits praise for its courage in staging…