Quantize Weight for Gemm/Conv on Quantized Model (#22969)
Some quantized models have QDQ around Conv/Gemm but the weight and/or
bias are not quantized. This PR adds WeightBiasQuantization optimizer to
quantize float weight and/or bias to INT8 and INT32 tensors
respectively. We only do this for weight and/or bias initializer so that
ConstantFolding will fold the sub-graph to real quantized initializers
during the graph optimization next round.
