Qualcomm AI Engine Direct - Adding QNN backend support for tan core ATen op

[qti-horodnic]

Summary

Added support for the core aten op tan using a decomposition pass and the identity:

tan(x) = sin(x) / cos(x)

Test plan

python backends/qualcomm/tests/test_qnn_delegate.py TestQNNQuantizedOperator.test_qnn_backend_tan --model SM8750 --host aisw-vm15-labsd --device 545ee4aa --build_folder build-android
python backends/qualcomm/tests/test_qnn_delegate.py TestQNNFloatingPointOperator.test_qnn_backend_tan --model SM8750 --host aisw-vm15-labsd --device 545ee4aa --build_folder build-android

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19301

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✅ You can merge normally! (2 Unrelated Failures)

As of commit bc38993 with merge base 371cb1c ():

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / macos / macos-job (gh) (trunk failure)
  devtools/intermediate_output_tap/tests/test_coreml_e2e.py::CoreMLEndToEndTest::test_tap_compare_static_llama_coreml
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  devtools/intermediate_output_tap/tests/test_coreml_e2e.py::CoreMLEndToEndTest::test_tap_compare_static_llama_coreml

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[qti-horodnic]

@pytorchbot label "release notes: qualcomm"

[psiddh]

Other than the poetntial merge conflict in README, lgtm, accepting it to unblock

[qti-horodnic]

Other than the poetntial merge conflict in README, lgtm, accepting it to unblock

Addressed that now, thanks