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Changes:
1. Adds a new Franka cube stacking visuomotor environment as per Cosmos
requirements: higher resolution and multi-modality support.
2. Adds scripts for data pre-processing and post-processing before and
after Cosmos augmentation respectively.
3. Adds evaluation of trained visuomotor policies for robustness to
visual changes using domain randomization.
4. Makes task termination checks more strict for the Franka cube
stacking task.
5. Adds new documentation for the Cosmos imitation learning pipeline.

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- New feature (non-breaking change which adds functionality)
- This change requires a documentation update

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] I have updated the changelog and the corresponding version in the
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---------
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