Add image to image to chat completions pipeline

[Josh-XT]

Feature/Improvement Description

Add image to image to chat completions pipeline.

We currently have text to image and image to text in the pipeline, but image to image will only happen because of the visual response being injected and it isn't actually showing the image to the image generation provider at any point.

Proposed Solution

Create image_to_image functions for image providers and build that into the pipeline to do instead of image_generation if an image was also uploaded.