[quant] EqualizationQConfig to distinguish input/output activations (#59739)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59739
Created an EqualizationQConfig specifically for equalization.
This inherits from QConfig and is used to distinguish between inserting
an input observer with an output observer. Since the output observer
field is included in the EqualizationQConfig, we no longer need an
output observer field in the _InputEqualizationObserver
Test Plan:
compiles
Imported from OSS
Reviewed By: ezyang
Differential Revision: D29135298
fbshipit-source-id: 3dde9c029c291467ff0a0845f0fc9c44573fc6f6
