Preload image on worker

[cbroms]

There are some instances where it might be nice to have additional information about a page's image to inform what template to use. For example, if the image is vertical, put it beside the description text as opposed to above it. This would likely involve fetching the image on the worker and doing some light work to determine orientation and size. You might also so some sort of average color calculation or get the accent colors to use this in the popup.

[cbroms]

If the image is being loaded on the worker, it might also make sense to also compress it and send it to the client, rather than the client making a request to the origin for the image. This could potentially prevent tracking of the requestor, decrease the amount of data passed from worker to client, and enable us to customize the popup with attributes from the image.

[cbroms]

Thinking a bit more about this, we'll need to somehow serve the image from the worker. Perhaps using cloudflare's KV makes sense. Something like this

1. Client request to get link info made, fetch page and parse out info and image
2. Add an indication that image loading is pending
3. Respond with page info and future path to image
4. Fetch the image, compress and base64 encode
5. (may be before or during step 4) client request to image made
6. Respond with image or wait for image to be available