[Quant tool] Ensure MSFT opset for Q/DQ models (#19335)
### Description
Updates qdq quantization to ensure the final model has the
`com.microsoft` opset import if the model uses Q/DQ ops with the
`com.microsoft` domain (e.g., for int16 quantization)
### Motivation and Context
Need to ensure the MSFT domain is correctly set for all relevant cases.
Otherwise, shape inferencing tools will raise an exception.