`[INotifyPropertyChanged]` is not supported on records

### Describe the bug

When applied to record (class) types, the `[INotifyPropertyChanged]` attribute has no effect.

### Regression

_No response_

### Steps to reproduce

```cs
[INotifyPropertyChanged]
partial record Record()
{
[ObservableProperty]
private int x;
}
```

### Expected behavior

The `PropertyChanged` event and the `OnPropertyChanged` method are generated.

### Screenshots

_No response_

### IDE and version

VS 2022 Preview

### IDE version

_No response_

### Nuget packages

- [ ] CommunityToolkit.Common
- [ ] CommunityToolkit.Diagnostics
- [ ] CommunityToolkit.HighPerformance
- [X] CommunityToolkit.Mvvm (aka MVVM Toolkit)

### Nuget package version(s)

8.1.0

### Additional context

_No response_

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