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* [bc-breaking] Generalize FakeQuantizeConfig beyond intx

 **Summary:** The existing `FakeQuantizeConfig` performs only
intx quantization, but we plan to extend QAT to other dtypes
such as fp8 and nvfp4 in the near future. This is the necessary
refactor before that. Specifically:

```
# New abstract class
FakeQuantizeConfigBase
# Rename
FakeQuantizeConfig -> IntxFakeQuantizeConfig
```

In the future, we will have other types of `FakeQuantizeConfigBase`
for float dtypes that users can pass in instead of the existing
Intx one.

**BC-breaking notes:** For BC, we keep around the old names to
reference the new ones. However, this commit is still BC-breaking
in the sense that a few APIs now accept the abstract
`FakeQuantizeConfigBase` instead. For the most part, this abstract
class will be hidden from the user.

Before:
```
activation_config = FakeQuantizeConfig(torch.int8, "per_token", is_symmetric=False)
weight_config = FakeQuantizeConfig(torch.int4, group_size=32)
```

After:
...