The new Bob Odenkirk film “Normal” is now available to rent or buy on digital and it’s a blast. Literally. In fact, in the words of the screenwriter Derek Kolstad, “It’s not a film. It’s a f***in’ movie!” I had the chance to chat with Kolstad, who is also the creator of the “John Wick” franchise and the writer of Odenkirk’s “Nobody,” and it became clear why “Normal” is the fun flick that it is—because Kolstad loves what he does. And it sounds li…