[WIP] Simulator Stepping Functionality

[Eric-Vin]

Description

Adds the ability to run simulations in a stepped mode, using a context manager.

Issue Link

N/A

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

N/A

[codecov]

Codecov Report

❌ Patch coverage is 95.53571% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.02%. Comparing base (156b54b) to head (61e61b8).

Files with missing lines	Patch %	Lines
src/scenic/core/simulators.py	95.53%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #312      +/-   ##
==========================================
+ Coverage   90.01%   90.02%   +0.01%     
==========================================
  Files          54       54              
  Lines       13585    13614      +29     
==========================================
+ Hits        12228    12256      +28     
- Misses       1357     1358       +1     

Files with missing lines	Coverage Δ
src/scenic/core/simulators.py	96.14% <95.53%> (+0.08%)	⬆️

... and 4 files with indirect coverage changes

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[Eric-Vin]

Combined with PR #422.