Series and Index have inconsistent repr
Series and Index format differently when printed to the console (e.g., `dtype: object` vs. `dtype='object'`), but likely they should look the same (Index seems better IMO since it matches the constructor and agrees with numpy).

```python
In [11]: pd.Series([], dtype=object, name="abc")                                                                                                                                                             
Out[11]: Series([], Name: abc, dtype: object)

In [12]: pd.Index([], dtype=object, name="abc")                                                                                                                                                              
Out[12]: Index([], dtype='object', name='abc')
```