Llama3.2 vision model AOTI integration

[larryliu0820]

🚀 The feature, motivation and pitch

Need work to enable:

python3 torchchat.py export llama3.2-11B --output-aoti-package-path exportedModels/llama3_2_artifacts.pt2

Features to be added:

• Run AOTI export on preprocess, vision encoder and text decoder separately.
  • This requires dependency on torchtune's exportable modules and perform module transformation needed.
• Package them into a single pt2 file.

Alternatives

No response

Additional context

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RFC (Optional)

No response