[WIP] Quick Llama3.2 e2e tutorial

[RdoubleA]

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UX

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and a tutorial example

• I did not change any public API
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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/1685

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures

As of commit 6f15b62 with merge base 3a6d328 ():

NEW FAILURES - The following jobs have failed:

• Build Docs / build_docs (3.11) (gh)
• Lint / lint (3.10) (gh)

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[ebsmothers]

Let's add a pointer to this from the README as well