[WIP] OpenScenarioXML Export

[Eric-Vin]

Description

Allows one to export the result of a Scenic simulation to OpenScenarioXML.

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 19.44444% with 58 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.57%. Comparing base (20292f3) to head (8ecd602).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scenic/core/serialization.py	7.93%	58 Missing ⚠️

❌ Your patch check has failed because the patch coverage (19.44%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #421      +/-   ##
==========================================
- Coverage   89.89%   89.57%   -0.33%     
==========================================
  Files          54       54              
  Lines       13551    13631      +80     
==========================================
+ Hits        12182    12210      +28     
- Misses       1369     1421      +52     

Files with missing lines	Coverage Δ
src/scenic/core/simulators.py	96.14% <100.00%> (+0.08%)	⬆️
src/scenic/core/serialization.py	70.99% <7.93%> (-19.97%)	⬇️

... and 8 files with indirect coverage changes

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