TYP: pandas.core.series annotations from pandas-stubs

[twoertwein]

contains also changes in generic/frame.py but only to keep them consistent with series.py

edit: and added annotations for frame.py

[pep8speaks]

Hello @twoertwein! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers:

Comment last updated at 2022-08-15 19:26:20 UTC

[mroeschke]

Appears to be some typing failures

[twoertwein]

Appears to be some typing failures

The typing checks are now green :)

[mroeschke]

Thanks @twoertwein (failures were unreleated)