Improve data stored and shown for each image

[amiantos]

For example, artbot shows:

I'm logging and showing the request details, but not the other stuff yet.

[amiantos]

It looks like artbot is recording the model version separately from the rest of the request version... I don't think I care about implementing that personally.

The most basic version of this is implemented now, you can view full raw request and the raw response (excluding img url) in the image details view, in formatted JSON. It's basic, but it's fine for now.