Add support for SD3/Flow sampling on SDXL models

Preliminar support for SDXL + SD3/Flow sampling, tests are welcome, no more black images with some samplers. It seems for some reason, default reForge uses A1111 CompVis instead of the one on ldm_patched.modules.model_sampling. Still have to remove all the logging and comments, and more tests are needed. ~~Hires fix still doesn't work correctly~~ Seems to work now, alongside img2img. Samplers that work: - Euler Comfy - Euler A CFG++ - DPM++ SDE Comfy - DPM++ 2M Comfy - DPM++ 2M SDE Comfy - DPM++ 2S Ancestral Comfy RF - ER SDE - RES Multistep - Gradient Estimation - RES Solver - SEEDS 2 - SEEDS 3 - SA Solver Sampler that may work (basically using A1111 backend): - Euler - DPM++ SDE - DPM++ 2M - DPM++ 2M SDE - DPM++ 3M SDE To fix: - Euler A Comfy RF - DPM++ 3M SDE Comfy Other samplers are probably incompatible at the moment. Most of scheduler works, but not all of them play good with RF, like AYS. <img width="3807" height="1841" alt="imagen" src="https://github.com/user-attachments/assets/11637d3d-6909-4703-87a9-49440c6fd5a3" /> <img width="3773" height="1767" alt="imagen" src="https://github.com/user-attachments/assets/e7324186-197f-4cc1-ac8c-bd8e100d74fc" />