8-bit inference

### 🐛 Describe the bug

When using 8-bit inference, there is a hook function that is created by the `accelerate` library and that replaces the `forward` method. When using `inspect.getfullargspec` to set `self.forward_kwargs` with the arguments of `forward`, we actually inspect the arguments of the hook instead of the arguments of the real `forward` function called by the hook.

### Which trlX version are you using?

0.7.0

### Additional system and package information

_No response_