Will Thorne Staff WriterThe first meeting between caustic comedy doyenne Deborah (Jean Smart) and snarky Twitter-infamous writer Ava (Hannah Einbinder) in “Hacks” doesn’t exactly go well.Ava storms out after an exchange of withering putdowns, before Deborah screeches after her and offers her a job, closing the first chapter of the new HBO Max comedy and launching a complex mentor-mentee dynamic.“Hacks” at its heart is about mentorship, a theme it has in common with a good number of its fellow