Name part and Fact qualifier should be a list

https://github.com/dekoza/pyGedcomX/blob/b79227df2a58a8972a59767e30cd91279ec3ceb8/gedcomx/models.py#L167

https://github.com/dekoza/pyGedcomX/blob/b79227df2a58a8972a59767e30cd91279ec3ceb8/gedcomx/models.py#L187

These should be
```python
qualifiers: Union[None, list[Qualifier]] 
```