[Quant] Add fused LinearLeakyReLU module for onednn backend (#88661)
**Summary**
Post op fusion can reduce data movement overhead and improve inference performance. This PR adds fused `QLinearLeakyReLU` 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/88661
Approved by: https://github.com/jgong5, https://github.com/jerryzh168
