By Bonnie Stiernberg Another day, another development in the Will Smith slap saga: after firing off a brief tweet condemning the actor’s actions on Sunday night, the Academy has now released a lengthier statement about the incident in the form of a letter to its membership. In it, they reiterate that Smith’s assault of Chris Rock was “unacceptable and harmful” and reveal that an official investigation is underway — a process that could apparently take “a few weeks.” “Sunday’s telecast of the 94th Oscars was meant to be a celebration of the many individuals in our community who did incredible w…