Add cartesian_to_spherical().

[MLopez-Ibanez]

[codecov[bot]]

Codecov Report

Merging #1365 (64bc553) into main (01a12df) will increase coverage by 0.30%. The diff coverage is 100.00%.

:exclamation: Current head 64bc553 differs from pull request most recent head 083ccc1. Consider uploading reports for the commit 083ccc1 to get more accurate results

@@            Coverage Diff             @@
##             main    #1365      +/-   ##
==========================================
+ Coverage   92.08%   92.38%   +0.30%     
==========================================
  Files          82       82              
  Lines        4346     4283      -63     
  Branches      363      357       -6     
==========================================
- Hits         4002     3957      -45     
+ Misses        255      246       -9     
+ Partials       89       80       -9     

Impacted Files	Coverage Δ
src/poliastro/core/util.py	91.48% <100.00%> (-4.07%)	:arrow_down:
src/poliastro/twobody/orbit.py	85.04% <0.00%> (-2.89%)	:arrow_down:
src/poliastro/core/angles.py	95.55% <0.00%> (-0.05%)	:arrow_down:
src/poliastro/core/propagation/__init__.py	96.00% <0.00%> (-0.02%)	:arrow_down:
src/poliastro/twobody/propagation.py	91.75% <0.00%> (ø)
src/poliastro/core/thrust/__init__.py	100.00% <0.00%> (ø)
src/poliastro/core/thrust/change_argp.py	100.00% <0.00%> (ø)
src/poliastro/core/thrust/change_ecc_inc.py	100.00% <0.00%> (ø)
src/poliastro/twobody/thrust/change_argp.py	100.00% <0.00%> (ø)
... and 7 more

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[MLopez-Ibanez]

@astrojuanlu Something seems wrong with the checks. Not sure why they fail.