Added support for qaic backend for Qualcomm's AI Accelerator (#3926)
* Added QAIC backend files based on Shubham's 1.12 wheel.
* Little cleanup of imports and qaic device listing.
* Apply style fixes
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Co-authored-by: Meet Patel <quic-meetkuma@quicinc.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>