Qualcomm AI Engine Direct - Adding QNN backend support for scatter.src core ATen op

[qti-horodnic]

Summary

Added support for the core ATen op scatter.src using an op builder with the QNN implementation for ScatterElements. Note scatter.src uses ScatterElements directly with the argument reduction=NONE.

Test plan

python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNQuantizedOperator.test_qnn_backend_scatter_src --model SM8750 --host aisw-vm15-labsd --device 545ee4aa `--build_folder build-android
python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNFloatingPointOperator.test_qnn_backend_scatter_src --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/19283

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[qti-horodnic]

@pytorchbot label "release notes: qualcomm"