HappyNest Entertainment, the producer behind Paris Hilton’s “Paris & Pups” YouTube show, is in early development on several new projects, including a series with “Goosebumps” author R.L. Stine , an adaptation of the graphic novel “Louie and Bear,” and a franchise based on a decades-old kids’ STEM program. Best known for “Paris & Pups” (developed in collaboration with Paris Hilton’s 11:11 Media and 9 Story Media Group) and last year’s Chuck E. Cheese animated Christmas special on Amazon, kids’