Add PromptTemplate examples

[SalmanMohammadi]

Context

What is the purpose of this PR? Is it to

• add a new feature
• fix a bug
• update tests and/or documentation
• other (please add here)

Closes #1851

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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/1891

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• [PRE-EMPTIVE] Experimenting with new runners linux.aws.a100 on inductor-perf-compare.yml

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As of commit 833a84e with merge base dc0591c ():
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