'BOON' SHOCKS By DON KAPLAN 'THE Boondocks," probably the most controversial comic strip in newspapers right now, is poised to become the most controversial animated show on TV, too. The comic and the cartoon, both written by Aaron McGruder, follows the experiences and reflections of a black family - two kids, Huey and Riley, and their grandfather - who move from the inner city to the lily-white suburbs. Since 1999, when "Boondocks" first launched in newspapers as a syndicated strip, McGruder's musings on racism, politics and popular culture have frequently drawn fire from critics in all corners - and gotten the comic strip tossed out of some papers. In many cases, it runs on the editorial page instead of with the funnies. His new show faithfully brings the same shock-tactics to Adult Swim, the Cartoon Networks' popular late-night programming block for grownups. In it, his characters use the N-word frequently ("I think every episode is abo