Changes to sdpa and attention module to support vision encoder attent…

[tarun292]

…ion with no kv-cache

Summary

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Test plan

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❌ 4 New Failures

As of commit e5fdb66 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)
  RuntimeError: Command docker exec -t 0efd667926094db9ee8475219bccb87db131417d8c603888bd6f486d26e4579a /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  examples/models/llama3_2_vision/text_decoder/test/test_text_decoder.py::TextDecoderTest::test_llama3_2_text_decoder_aoti
• pull / unittest / macos / macos-job (gh)
  examples/models/llama3_2_vision/text_decoder/test/test_text_decoder.py::TextDecoderTest::test_llama3_2_text_decoder_aoti

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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.