dbr quant: refactor AutoQuantizationState._get_input_args_quant_dequant_info (#68343)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68343
Refactors `AutoQuantizationState._get_input_args_quant_dequant_info` to
use less internal state, makes the function have no side effects by passing
the state in the arguments, and moves the function to utils file.
This will help with a future refactor to cache this info at runtime.
Test Plan:
```
python test/test_quantization.py TestQuantizeDBR
```
Reviewed By: jerryzh168
Differential Revision: D32463760
Pulled By: vkuzo
fbshipit-source-id: bdd50b0772f128755f9b734b5eeb0a9f4bc4970b
