[Feature] Move worker-sandbox to an examples folder

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Description

It's standard for rust repos to have a folder named examples which holds examples of how to use the crate. I thought that the only examples were the README. It was only when searching in the issues pane for someone requesting fetch to be implemented that I found a link to lib.rs in worker-sandbox.

Would it be possible to rearrange this directory such that it follows the `examples` standard or this is called out as containing lots of examples?