ENH: adds new stability margin methods to flight

[Gui-FernandesBR]

Pull request type

• Code changes (bugfix, features)

Checklist

• Tests for the changes have been added (if needed)
• Docs have been reviewed and added / updated
• Lint (black rocketpy/ tests/) has passed locally
• All tests (pytest tests -m slow --runslow) have passed locally
• CHANGELOG.md has been updated (if relevant)

New behavior

Use the new properties to access stability margin at specific times.
This will be useful for the Monte Carlo analyses.

Breaking change

• No

Additional information

• Once we create these properties, we won't be able to delete them.
• I did not use cached property because I think the computational time for calling the functions is lower than the time spent to create a cached item in this case. Feel free to disagree.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.65%. Comparing base (f4f658c) to head (2456b11).
Report is 15 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #572      +/-   ##
===========================================
+ Coverage    72.62%   72.65%   +0.03%     
===========================================
  Files           59       59              
  Lines         9607     9614       +7     
===========================================
+ Hits          6977     6985       +8     
+ Misses        2630     2629       -1     

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[phmbressan]

I have just made a comment regarding the time at which simulation begin and if an initial solution or #568 change expected behavior of this method.

[MateusStano]

The new properties should be added to flight.prints as well!

[Gui-FernandesBR]

The new properties should be added to flight.prints as well!

Thank you for your suggestion. I solved it in c9cc0de

Can you re-review please? I need your approve now that you requested changes

[Gui-FernandesBR]

Got some inspiration from this PR and decided to refactor the whole flight_prints.py module directly: #579