MNT: Refactor inertia calculations using parallel axis theorem

[Gui-FernandesBR]

Pull request type

• Code maintenance (refactoring, formatting, tests)

Checklist

• Tests for the changes have been added (I don't think it's 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)

Current behavior

We apply the parallel axis theorem in many parts of the code today.

New behavior

I created a parallel axis theorem function in the tools.py module, so now all the calculations are centralized in a single place.
This makes the code more readable, as it quickly guides the reader when understanding the code.

Don't repeat yourself (DRY).

Breaking change

• No

Additional information

• In the future we might wanna add acceptance/integration tests to verify if our inertia calculations (After summing different components) are aligned with expected physics phenomena.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.70%. Comparing base (2a85ce8) to head (7b81e6e).
Report is 11 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #573      +/-   ##
===========================================
+ Coverage    72.66%   72.70%   +0.04%     
===========================================
  Files           59       59              
  Lines         9603     9618      +15     
===========================================
+ Hits          6978     6993      +15     
  Misses        2625     2625              

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[phmbressan]

The review might seems pedantic because everything is working right now, but I find really important since this method might be used in the future in other parts of the code as a "black box" and will lead to incorrect results if not well documented or understood.

[phmbressan]

Excellent, thank you for solving the review comments. Looks good.