Unified diffusion model trainer

[mxinO]

What does this PR do?

Type of change: new feature

Usage

For diffusion model distillation or finetuning. Support Wan2.2 models and LTX2 models. See readme.md for more details.

Testing

Tested with mock data

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• Is this change backward compatible?: ❌
  It will replace the old ltx2 trainer.
• If you copied code from any other sources or added a new PIP dependency, did you follow guidance in CONTRIBUTING.md: N/A
• Did you write any new necessary tests?: ❌
• Did you update Changelog?: ✅

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.52%. Comparing base (ade9567) to head (65efa55).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1082       +/-   ##
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- Coverage   75.72%   52.52%   -23.20%     
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  Files         476      475        -1     
  Lines       51068    51238      +170     
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- Hits        38670    26914    -11756     
- Misses      12398    24324    +11926     

Flag	Coverage Δ
examples	?
gpu	?
regression	?
unit	52.52% <ø> (+0.20%)	⬆️

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