[Future Spherical Class] Add SExtent #466

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ghiggi wants to merge 9 commits intopytroll:mainfrom

ghiggi:feature-sextent

Commits on Nov 8, 2022

Add SExtent draft and tests
ghiggi
committed

Commits on Nov 9, 2022

Add missing tests and features
ghiggi
committed

Commits on Nov 14, 2022

Add separate shapely tests
ghiggi
committed

Commits on Feb 7, 2023