Support splines in GraphvizAttrs.

[azriel91]

graphviz_attrs:
  splines: curved

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 38 lines in your changes missing coverage. Please review.

Project coverage is 22.35%. Comparing base (edc563e) to head (74a7096).
Report is 5 commits behind head on main.

Files	Patch %	Lines
crate/model/src/common/graphviz_attrs/splines.rs	0.00%	25 Missing ⚠️
crate/model/src/common/graphviz_attrs.rs	0.00%	8 Missing ⚠️
crate/rt/src/into_graphviz_dot_src/info_graph.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
- Coverage   22.52%   22.35%   -0.18%     
==========================================
  Files          62       63       +1     
  Lines        4946     4984      +38     
==========================================
  Hits         1114     1114              
- Misses       3832     3870      +38     

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