Adds ECI/ECEF state transforms#106

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ryanpavlick wants to merge 3 commits intogeospace-code:mainfrom

ryanpavlick:add-eci-ecef-state-transforms

Commits on Mar 27, 2026

adding karney.py module with Karney's geodesic algorithms for the ellipsoid and some additional functions in nvector.py; along with associated tests
ryanpavlick
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Commits on Apr 27, 2026