[Quant] Add fused LinearTanh module for onednn backend (#88923)
**Summary**
This PR adds fused `QLinearTanh` module for onednn backend, which will be used for int8 inference with onednn backend. Cannot call this module with other quantization backends otherwise an error is thrown.
**Test plan**
python test_quantization.py TestStaticQuantizedModule
Pull Request resolved: https://github.com/pytorch/pytorch/pull/88923
Approved by: https://github.com/jgong5, https://github.com/jerryzh168
