Draft: feat: add equinoctial orbital elements

[Derollez]

• Clean definitions and format
• Add tests
• Add bindings
• Check definitions and conversions on edge cases

[codecov]

Codecov Report

Attention: 198 lines in your changes are missing coverage. Please review.

Comparison is base (1be8bfd) 85.77% compared to head (2a41d58) 83.15%.

Files	Patch %	Lines
...rajectory/Orbit/Models/Equinoctial/Equinoctial.cpp	0.00%	198 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #293      +/-   ##
==========================================
- Coverage   85.77%   83.15%   -2.62%     
==========================================
  Files          71       72       +1     
  Lines        6304     6502     +198     
==========================================
  Hits         5407     5407              
- Misses        897     1095     +198     

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[vishwa2710]

Siiiiick. I think it's worth maybe re-organizing under an Orbital Elements class under orbits, where we can house COE, Mean Orbital Elements, Equinoctial, modified equinoctial etc.