Add replicad-script to add types sepcific to replicad .js/.ts files

[North101]

I've added some types for use in replicad scripts.

e.g.

import type {
  ShapesConfig,
} from "replicad"

// doesn't error
const {
  drawCircle,
  drawRectangle,
} = replicad

// ShapesConfig ensures the exported types are correct 
export default function main(params: typeof defaultParams): ShapesConfig {
  
}