Since 1978, cartoonist Jim Davis has explored the quotidian dramas of pet ownership via the daily travails of beleaguered Jon Arbuckle, his eager dog Odie, and the titular tubby orange tabby, Garfield. If the comic strip (the most widely syndicated in the world) is the weekly sitcom version of their story, then “The Garfield Movie,” the latest effort to bring Garfield to the big screen, is the…