Add in option for Dalle3

[x] Add new discord command
[x] Make new dalle image request function
[x] Add new dalle image endpoint to use
[x] update database to handle adding of dalle images (accept nulls for bespoke fields that other model wouldn't have)
[x] dalle image requests saved successfully in the database
[x] handle revised prompt return from openai (display it in response card, store in db)
[x] Add dalle api key to github secrets

bigwhitetuna / dream