dbr quant: add limited support for `torch.nn.ModuleList` (#70372)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70372
Enables basic support for `torch.nn.ModuleList` in DBR quant
by stopping it from being a leaf. For now, we
require the user to check for `AutoQuantizationState` if they are
looping over the contents without any bounds checking.
In future PRs, we can explore how to solve this without requiring
user code changes.
Test Plan:
```
python test/test_quantization.py TestQuantizeDBR.test_module_list
```
Reviewed By: VitalyFedyunin
Differential Revision: D33302329
Pulled By: vkuzo
fbshipit-source-id: 1604748d4b6c2b9d14b50df46268246da807d539