Although “The Buccaneers” comes with the literary pedigree of being based on Edith Wharton’s last, unfinished novel, the series so desperately wants to emulate “Bridgerton” that it almost makes your teeth ache, down to the mix of corsets and contemporary music. The result is a mildly watchable Apple TV+ series that proves, to quote Fred Allen, imitation is the sincerest form of streaming, too.