New indexed graph backend

[JoOkuma]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.21739% with 17 lines in your changes missing coverage. Please review.

Project coverage is 88.64%. Comparing base (35996ee) to head (e94b0f6).

Files with missing lines	Patch %	Lines
src/tracksdata/graph/_rustworkx_graph.py	85.21%	11 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
- Coverage   88.83%   88.64%   -0.19%     
==========================================
  Files          42       42              
  Lines        2258     2370     +112     
  Branches      389      403      +14     
==========================================
+ Hits         2006     2101      +95     
- Misses        153      164      +11     
- Partials       99      105       +6     

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