Remove pandas.io.stata from Typing Blacklist

[WillAyd]

Here's the list of current errors:

pandas/io/stata.py:32: error: Module 'pandas' has no attribute 'DatetimeIndex'
pandas/io/stata.py:32: error: Module 'pandas' has no attribute 'concat'
pandas/io/stata.py:32: error: Module 'pandas' has no attribute 'isna'
pandas/io/stata.py:32: error: Module 'pandas' has no attribute 'to_datetime'
pandas/io/stata.py:32: error: Module 'pandas' has no attribute 'to_timedelta'
pandas/io/stata.py:1730: error: Name 'data_label' already defined on line 1052

For the former we should just use absolute imports instead of pulling from top level pandas object (per discussion in #25923). The last issue I think is just a method shadowing a instance variable which I think can safely be removed

[ryankarlos]

Ill make a PR for this as well since I've already done similar for #25934 and #25933

[bashtage]

@WillAyd I think this can be closed.