Include map options in road network cache

[lola831]

Description

This PR makes the .snet cache also depend on map options.
I added a new deterministicHash helper and use it for both map options and scene serialization (CompileOptions.hash).
Since the scene options hash changed, I bumped the scene format version to 3.

Issue Link

#393

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 94.73684% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.04%. Comparing base (73a3580) to head (09cb0f6).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scenic/domains/driving/roads.py	92.85%	1 Missing ⚠️
src/scenic/syntax/translator.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #425      +/-   ##
==========================================
+ Coverage   89.93%   90.04%   +0.11%     
==========================================
  Files          54       54              
  Lines       13562    13585      +23     
==========================================
+ Hits        12197    12233      +36     
+ Misses       1365     1352      -13     

Files with missing lines	Coverage Δ
src/scenic/core/serialization.py	91.46% <100.00%> (+0.51%)	⬆️
src/scenic/domains/driving/roads.py	95.30% <92.85%> (+1.03%)	⬆️
src/scenic/syntax/translator.py	93.57% <90.90%> (+1.48%)	⬆️

... and 6 files with indirect coverage changes

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[dfremont]

For a future PR: we should switch from tmpdir_factory to tmp_path_factory so that we already have Path objects and don't need to do this conversion.

[dfremont]

Looks great -- just one very minor change and a suggestion for later. Also we'll need to fix the merge conflicts.