Separate out @pleasantest/testing-library and @pleasantest/jest-dom and @pleasantest/user-event

Those could be three separate libraries (still maintained in this repo, but published to npm separately) so that they could be used on projects that don't use test mule but do use puppeteer/jest (like a client project).

The main roadblocks:
- They are in the same build scripts
- This repo is not set up as a monorepo: look into [lerna](https://github.com/lerna/lerna) and [bolt](https://github.com/boltpkg/bolt)
- They all depend on the vite server to send the client-side library files. We do need some kind of server to send the files so that the browser can cache the libraries, but really there is no benefit of using vite for this over a boring http server based on the http module. It would probably be just a few lines of code (and reasonably fast) to spin up and spin down the http server per function call