feat: adding output gif for newtonian simulator

[abanuelo]

Description

As a way to illustrate dynamic scenarios more concretely in Google Colab, added a feature to show dynamic scenarios via an output gif. See the output gif when running:

scenic examples/driving/badlyParkedCarPullingIn.scenic -S -m scenic.simulators.newtonian.driving_model --2d

saved-gif.mov

Also I am adding that it works with Colab:

dynamic_newtonian.mov

Issue Link

Checklist

• I have tested the changes locally via pytest and/or other means
• I have added or updated relevant documentation
• I have autoformatted the code with black and isort
• I have added test cases (if applicable)

Additional Notes

[codecov]

Codecov Report

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Additional details and impacted files

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Files	Coverage Δ
src/scenic/simulators/newtonian/simulator.py	89.94% <100.00%> (ø)