Add ImageToImage capabilities

Switching to the correct tag

Marcus asked me to test this alongside https://www.drupal.org/project/ai/issues/3531212 ✨ Create Image-To-Image operation type Active

Testing Steps

Set up a new local Drupal, then added modules with source via:

composer require 'drupal/ai:1.2.x-dev' -W --prefer-source
composer require 'drupal/ai_provider_dreamstudio:1.0.x-dev' -W --prefer-source

Enabled modules via (AI gets enabled as it's a dependency):

drush en -y ai_provider_dreamstudio
drush en -y ai_api_explorer

Added a new Key with my API key from DreamStudio / Stability AI
Set up the provider for the Image-to-Image

Went to the Image-to-Image Explorer page at: /admin/config/ai/explorers/image_to_image_generator

I tried a few options.

The Outpaint does not seem to generate a new image.
The Erase sort of works, at least the image is edited but it might have been the combination of the image and mask image that produced a weird overlay effect.
The Remove Background worked as expected.

One thing I noticed, when I first loaded the explorer, I think I clicked on Upscale but the "prompt" field was not showing up on first load, so when I clicked generate I got this error - but I think this is unrelated to this provider issue
Error invoking model response: The Dreamstudio API returned an error: {"errors":["prompt: string must contain at least 1 character(s)"],"id":"f470c1eeea8ba89398fc93769c9adfaa","name":"bad_request"} with code 400

@Marcus, should this be "Needs review" or RTBC? It was "Active" when I tested it but I wasn't sure if you were planning further changes to the MR