## Summary

This PR adds a new `worker` strategy to the `<Script />` component that automatically relocates and executes the script in a web worker.

```jsx
<Script 
  strategy="worker"
  ...
/>
```

[Partytown](https://partytown.builder.io/) is used under the hood to provide this functionality.

## Behavior

- This will land as an experimental feature and will only work behind an opt-in flag in `next.config.js`:

  ```js
  experimental: {
    nextScriptWorkers: true
  }
  ```

- This setup use a similar approach to how ESLint and Typescript is used in Next.js by showing an error to the user to install the dependency locally themselves if they've enabled the experimental `nextScriptWorkers` flag.

  <img width="1068" alt="Screen Shot 2022-03-03 at 2 33 13 PM" src="https://user-images.githubusercontent.com/12476932/156639227-42af5353-a2a6-4126-936e-269112809651.png">
- For Partytown to work, a number of static files must be served directly from the site (see [docs](https://partytown.builder.io/copy-library-files)). In this PR, these files are automatically copied to a `~partytown` directory in `.next/static` during `next build` and `next dev` if the `nextScriptWorkers` flag is set to true.

## Checklist

- [X] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [X] Related issues linked using `fixes #number`
- [X] Integration tests added
- [X] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.

This PR fixes #31517.