ENH: add Folium interactive flight trajectory map (#963)

[thatrandomasiandev]

Summary

• Add Flight.plots.trajectory_on_map() using optional Folium to render an interactive HTML map of the ground track with launch and landing markers.
• Introduce a maps optional dependency extra (folium) and include it in rocketpy[all].
• Add unit tests that mock Folium when absent and exercise real HTML export when Folium is installed.

Fixes #963

Test plan

• PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 pytest tests/unit/test_flight_trajectory_map.py
• Smoke: flight.plots.trajectory_on_map(filename="traj.html") opens in a browser with path + markers

[Gui-FernandesBR]

There are many other ways of implementing this one. We need first to reflect on that.

[codecov]

Codecov Report

❌ Patch coverage is 96.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.55%. Comparing base (e0ff281) to head (2f52628).
⚠️ Report is 65 commits behind head on develop.

Files with missing lines	Patch %	Lines
rocketpy/plots/flight_plots.py	96.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1132      +/-   ##
===========================================
+ Coverage    82.18%   83.55%   +1.37%     
===========================================
  Files          122      130       +8     
  Lines        16355    17111     +756     
===========================================
+ Hits         13441    14297     +856     
+ Misses        2914     2814     -100     

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