ENH: Insert apogee state into solution list during flight simulation

[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)

Current behavior

Recently reported on discord:

New behavior

The problem was related to Function interpolations. I added the apogee state to the state solution so it created a point at the minimum value of the free stream speed curve (i.e. the apogee). This way we reduced the error when evaluating the stream speed at apogee.

Breaking change

• No

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.71%. Comparing base (655f4be) to head (673ac84).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #638   +/-   ##
========================================
  Coverage    75.70%   75.71%           
========================================
  Files           81       81           
  Lines         9813     9815    +2     
========================================
+ Hits          7429     7431    +2     
  Misses        2384     2384           

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