Googlewrapper

- Clarified function names in GoogleSheets to more represent its action
- Methods that refer to tabs, are now properly labeled tab and not sheet

- Bug Fix: GA.\_create_df() fixed column renaming issue

- Tests added: Sheets, GSC (basic)
- Now formated with <a href=https://github.com/psf/black>black</a>
- Added type hints package wide
- Passing mypy, flake8 & pytest
- Expanded examples

- Added feature to create brand new google sheet
- Changed relative import to remove module name for importing (from "googlewrapper.ga" to just "googlewrapper")

- Fixed bug in sheets.py when deleting one tab

- Clarified Doc Strings
- Ready for Beta testing