MIAMI — Key Biscayne residents rattled by reports of a longtime coach trailed by allegations that he sexually abused young gymnasts roughly 10 years ago may get some answers from the village on Tuesday. On the Key Biscayne council’s regular meeting agenda is a “special presentation” by Chief Francis Sousa in response to a petition asking for a town hall to discuss sex abuse allegations involving the coach, Oscar Olea. Olea has been charged with no crime and can still coach, although one gym he had been coaching at said he is no longer welcome there. It is the first scheduled public meeting sin…