Added computation of private jet emissions

[jorgecardleitao]

Estimation is now based:

• ICAO official numbers
• consumption of the aircraft models, as advertised on websites selling private jets
• research on Radiative Forcing and Life-cycle emissions

See changes to methodology.

[codecov-commenter]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (fa593c9) 82.53% compared to head (2dfb2bc) 80.49%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/private_emissions.rs	0.00%	13 Missing ⚠️
src/consumption.rs	0.00%	6 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   82.53%   80.49%   -2.04%     
==========================================
  Files          14       16       +2     
  Lines         750      769      +19     
==========================================
  Hits          619      619              
- Misses        131      150      +19     

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