Add torchao as a depdency

[jerryzh168]

Stack from ghstack (oldest at bottom):

• -> Add torchao as a depdency #2386

Summary:
att

Test Plan:
CI

Reviewers:

Subscribers:

Tasks:

Tags:

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/2386

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure, 2 Unrelated Failures

As of commit 9c42253 with merge base 42eeebc ():

NEW FAILURE - The following job has failed:

• Build documentation / build (buck2) / Build doc (gh)
  RuntimeError: Command docker exec -t dd9be9415ee5e282926d52a7e5ade580fb94761692db1f368bab332f7b3bafa6 /exec failed with exit code 2

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Build ExecuTorch demo apps / test-demo-ios / macos-job (gh)
• pull / unittest / macos (buck2) / macos-job (gh)

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