[WIP] Wan2.2 (huggingface#12004)

* support wan 2.2 i2v

* add t2v + vae2.2

* add conversion script for vae 2.2

* add

* add 5b t2v

* conversion script

* refactor out reearrange

* remove a copied from in skyreels

* Apply suggestions from code review

Co-authored-by: bagheera <[email protected]>

* Update src/diffusers/models/transformers/transformer_wan.py

* fix fast tests

* style

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Co-authored-by: bagheera <[email protected]>

Author: 2 people