feat(policies): Add FastWAM Policy (#3834)

* Add FastWAM policy

* Add FastWAM policy review updates

* big refactor to use models from diffusers and transformers

* changing reproducable results

* preparing for training adding some temporary debug code aswell to visualize model output

* re-parenting of some layers to enable proper zero-3 FSDP

* linting

* small fix for the preprocessor and padded images

* removing some preprocessors

* removing temporary debug code

* cleaning up

* updating uv lock after rebasing

* adding lazy imports

* linting

* fixing stale assertion

* make tokenizer/text-encoder model ids configurable + some nits

* moving and renaming files to have a cleaner file tree

* removed asserts from the model, added guard instead and completely removed useless asserts

* cleaning up imports

* removing is_main_process and custom logging logic

* removing unused / stale attention path, removing some of the stale forwards within wan/models

---------

Co-authored-by: ZibinDong <zibindong@outlook.com>
Co-authored-by: Steven Palma <imstevenpmwork@ieee.org>

docs/source/_toctree.yml

@@ -69,6 +69,8 @@
     title: VLA-JEPA
   - local: eo1
     title: EO-1
+  - local: fastwam
+    title: FastWAM
   - local: groot
     title: NVIDIA GR00T N1.5
   - local: xvla