pcq embedding draft

[haowhsu-quic]

Test plan

python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNQuantizedOperator.test_qnn_backend_embedding -b build-x86 -x

[pytorch-bot]

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As of commit 0e9cfc3 with merge base 0a8b904 ():
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[billmguo]

which qnn backend has the ops enabled? did you test the numerical with llm model?