Quick fix to install regular .js npm packages

Let's say I start a new project. I start writing out an import for, say, `express` because I'm certain I'll be using that, but I haven't bothered to install it yet. ```ts import express from "express"; ``` Immediately, I might get an error like `Cannot find module 'express'.` because I didn't install the package before using it. This happens regardless of if I have `noImplicitAny` on. But this means I have to switch to a terminal and do an npm install. We already give a quick fix to install missing `@types` packages, we should have a fix that 1. Gives the option of installing a missing package as a dependency or a dev dependency. 2. Also installs the types for that package if necessary in the same fashion.