Add node_{width,height}{s,_default} and fixed_size

[azriel91]

• Support node_width_default in GraphvizAttrs.
• Support node_widths in GraphvizAttrs.
• Support node_height_default in GraphvizAttrs.
• Support node_heights in GraphvizAttrs.
• Support fixed_size in GraphvizAttrs.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 132 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@2353bc4). Learn more about missing BASE report.
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
crate/model/src/common/graphviz_attrs.rs	0.00%	40 Missing ⚠️
crate/rt/src/into_graphviz_dot_src/info_graph.rs	0.00%	38 Missing ⚠️
...te/model/src/common/graphviz_attrs/node_heights.rs	0.00%	22 Missing ⚠️
...ate/model/src/common/graphviz_attrs/node_widths.rs	0.00%	22 Missing ⚠️
...rate/model/src/common/graphviz_attrs/fixed_size.rs	0.00%	7 Missing ⚠️
crate/model/src/theme/any_id_or_defaults.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #37   +/-   ##
=======================================
  Coverage        ?   21.74%           
=======================================
  Files           ?       66           
  Lines           ?     5123           
  Branches        ?        0           
=======================================
  Hits            ?     1114           
  Misses          ?     4009           
  Partials        ?        0           

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