extra causes issue

[abhinavdayal]

When trying to export models with extra="allow" setting in the config, We get error:

AttributeError: type object 'Config' has no attribute 'extra'

In cli/script.py line 257

After modifying to

# Handle case when config is a Pydantic model's Config class
            if hasattr(config, 'extra'):
                if config.extra != "allow":
                    revert["extra"] = config.extra
                    config.extra = "forbid"  # type: ignore
            else:
                # If `extra` doesn't exist in the `Config`, handle it accordingly
                revert["extra"] = None  # No need to set, just ensure we avoid issues

Makes it to work