Add position vs time plot to Hamiltonian pendulum

[omaripaul57]

Is your feature request related to a problem? Please describe.
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This feature request is related to a feature branch that already exist (feature/example_notebooks). I will work on that existing branch to add this small feature.

Describe the solution you'd like
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Just a few lines of code in the hamiltonian_pendulum_notebook will do the trick.

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N/A

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