Add utils to replace torchtune SDPA with ET Custom SDPA

[tarun292]

Stack from ghstack (oldest at bottom):

• Add test case to export, quantize and lower vision encoder model for ET #7532
• -> Add utils to replace torchtune SDPA with ET Custom SDPA #7531
• Changes to SDPA to support no kv cache export #7530

Differential Revision: D67878161

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7531

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❌ 4 New Failures

As of commit 01fa0f8 with merge base 68c0208 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for extension/llm/modules/attention.py:
• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv) / linux-job (gh)
  No files were found with the provided path: /home/ec2-user/actions-runner/_work/_temp/artifacts/. No artifacts will be uploaded.
• pull / unittest / linux / linux-job (gh)
  extension/llm/modules/test/test_attention.py::AttentionTest::test_attention_torch_cond_eager
• pull / unittest / macos / macos-job (gh)
  extension/llm/modules/test/test_attention.py::AttentionTest::test_attention_torch_cond_eager

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[tarun292]

@tarun292 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[jackzhxng]

I think this might break the non kv cache version of the text decoder, in that case input_pos is also None Should be okay actually

[tarun292]

@tarun292 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[tarun292]

@tarun292 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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[github-actions]

Looks like this PR hasn't been updated in a while so we're going to go ahead and mark this as Stale.
Feel free to remove the Stale label if you feel this was a mistake.
If you are unable to remove the Stale label please contact a maintainer in order to do so.
If you want the bot to never mark this PR stale again, add the no-stale label.
Stale pull requests will automatically be closed after 30 days of inactivity.