Add a new SanaSprintImg2ImgPipeline class to the diffusers library as an image-to-image variant of the…

Add a new SanaSprintImg2ImgPipeline class to the diffusers library as an image-to-image variant of the…: a task in HF ML Tasksmith (Harbor dataset). Constructor: accepts tokenizer , text encoder (Gemma2), vae (AutoencoderDC), transformer (SanaTransformer2DModel), and scheduler ( SCMScheduler …