ENH: adds an 3D animation of flight trajectory #523

Is your feature request related to a problem? Please describe.

Visualizing the flight trajectory in a 3D plot is one of the key features of RocketPy.
However, we currently do not provide any kind of animation representing the flight.

Describe the solution you'd like

• The code is already done and tested, but needs to be updated and committed again. master...animate_flight
• Whoever take the code and re-write it in a new, refreshed branch, please also give credits to Patrick Sampaio.

Additional context

Maybe the vedo package could be added as an optional dependency.