feat: add post using destr to pass an object of data to a client side script in astro

[chrisvaillancourt]

Use destr to parse a JSON string in a client side script.

Astro's docs on passing data from the server side to client side only show how to pass simple strings to client side scripts. With this approache can pass a stringified object that we parse client side.

Also add an example showing the parsing done in a worker.