Add z-image-omni-base implementation (#12857)
* Add z-image-omni-base implementation
* Merged into one transformer for Z-Image.
* Fix bugs for controlnet after merging the main branch new feature.
* Fix for auto_pipeline, Add Styling.
* Refactor noise handling and modulation
- Add select_per_token function for per-token value selection
- Separate adaptive modulation logic
- Cleanify t_noisy/clean variable naming
- Move image_noise_mask handler from forward to pipeline
* Styling & Formatting.
* Rewrite code with more non-forward func & clean forward.
1.Change to one forward with shorter code with omni code (None).
2.Split out non-forward funcs: _build_unified_sequence, _prepare_sequence, patchify, pad.
* Styling & Formatting.
* Manual check fix-copies in controlnet, Add select_per_token, _patchify_image, _pad_with_ids; Styling.
* Add Import in pipeline __init__.py.
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Co-authored-by: Jerry Qilong Wu <xinglong.wql@alibaba-inc.com>
Co-authored-by: YiYi Xu <yixu310@gmail.com>
