[refactor] Wan single file implementation (#11918)
* update
* update
* update
* add coauthor
Co-Authored-By: Dhruv Nair <dhruv.nair@gmail.com>
* improve test
* handle ip adapter params correctly
* fix chroma qkv fusion test
* fix fastercache implementation
* remove set_attention_backend related code
* fix more tests
* fight more tests
* add back set_attention_backend
* update
* update
* make style
* make fix-copies
* make ip adapter processor compatible with attention dispatcher
* refactor chroma as well
* attnetion dispatcher support
* remove transpose; fix rope shape
* remove rmsnorm assert
* minify and deprecate npu/xla processors
* remove rmsnorm assert
* minify and deprecate npu/xla processors
* update
* Update src/diffusers/models/transformers/transformer_wan.py
---------
Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>
