UxDataset.__setitem__



Should it not be 
```python
if isinstance(value, ux.DataArray): # or something
    value = value.to_dataarray()
super().__setitem__(key, value)
```

i.e. pass a standard DataArray to the superclass Dataset?

_Originally posted by @dcherian in https://github.com/UXARRAY/uxarray/pull/216#discussion_r1121081445_
            