Propose to update & upgrade SkyReels-V2 (#12167)
* fix: update SkyReels-V2 documentation and moving into attn dispatcher
* Refactors SkyReelsV2's attention implementation
* style
* up
* Fixes formatting in SkyReels-V2 documentation
Wraps the visual demonstration section in a Markdown code block.
This change corrects the rendering of ASCII diagrams and examples, improving the overall readability of the document.
* Docs: Condense example arrays in skyreels_v2 guide
Improves the readability of the `step_matrix` examples by replacing long sequences of repeated numbers with a more compact `value×count` notation.
This change makes the underlying data patterns in the examples easier to understand at a glance.
* Add _repeated_blocks attribute to SkyReelsV2Transformer3DModel
* Refactor rotary embedding calculations in SkyReelsV2 to separate cosine and sine frequencies
* Enhance SkyReels-V2 documentation: update model loading for GPU support and remove outdated notes
* up
* up
* Update model_id in SkyReels-V2 documentation
* up
* refactor: remove device_map parameter for model loading and add pipeline.to("cuda") for GPU allocation
* fix: update copyright year to 2025 in skyreels_v2.md
* docs: enhance parameter examples and formatting in skyreels_v2.md
* docs: update example formatting and add notes on LoRA support in skyreels_v2.md
* refactor: remove copied comments from transformer_wan in SkyReelsV2 classes
* Clean up comments in skyreels_v2.md
Removed comments about acceleration helpers and Flash Attention installation.
* Add deprecation warning for `SkyReelsV2AttnProcessor2_0` class
