SPECIAL PREMIERE: Last year’s prime-time James Corden Carpool Karaoke special, in which he drove around Liverpool with Sir Paul McCartney and presented a surprise McCartney mini-concert at a local pub, was my favorite TV moment of last year. I don’t expect to be similarly moved by this year’s outing, which is dominated by him driving Celine Dion around the Las Vegas strip – but I’ll still watch, and listen, with interest, because the “Carpool Karaoke” concept is one of the purest new TV ideas in years. And speaking of years: It’s been four years since Corden premiered as a late-night host for CBS. Since then, he’s proven so valuable to the network – not only as Late Late Show host and viral video star, but as reliably entertaining host of both the Grammys and Tonys on CBS – that his contract renewal at the end of this season should be a foregone conclusion. And he deserves such a big raise, it should be an eightgone conclusion, at least…