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fd705bd8 - [Modular] refactor Wan: modular pipelines by task etc (#13063)

[Modular] refactor Wan: modular pipelines by task etc (#13063) * initil * fix init_pipeline etc * style * copies * fix copies * upup more * fix test * add output type (#13091) --------- Co-authored-by: yiyi@huggingface.co <yiyi@ip-26-0-160-103.ec2.internal> Co-authored-by: Álvaro Somoza <asomoza@users.noreply.github.com>