[quant] Add op support for linear_relu_dynamic_fp16 (#63824)

[quant] Add op support for linear_relu_dynamic_fp16 (#63824)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63824

Add a fused operator implementation that will work with the quantization fusion APIs.
Once FBGEMM FP16 kernel supports relu fusion natively we can remove the addition from the PT operator.

Test Plan:
python test/test_quantization.py

Imported from OSS

Reviewed By: heitorschueroff

Differential Revision: D30503514

fbshipit-source-id: 6bf3bd53f47ffaa3f1d178eaad8cc980a7f5258a