[quant] Make choose_qparams_optimized return Tensors to preserve dtype (#45530)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45530
Returning double values requires special handling as a return type for aten functions.
Instead return tensors where the type is preserved in the tensor dtype
Test Plan:
python test/test_quantization.py TestQuantizedTensor.test_choose_qparams_optimized
Imported from OSS
Reviewed By: dskhudia
Differential Revision: D24001134
fbshipit-source-id: bec6b17242f4740ab5674be06e0fc30c35eb0379
