Struct attrributes

[yfukai]

Partially solves #194 by allowing pl.Struct saved and searched in graphs.
Assumes #262 merged.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 74.14248% with 98 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.96%. Comparing base (e10d8c3) to head (4af9904).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/tracksdata/graph/_sql_graph.py	78.57%	20 Missing and 13 partials ⚠️
src/tracksdata/graph/_base_graph.py	70.58%	18 Missing and 2 partials ⚠️
src/tracksdata/utils/_dtypes.py	72.60%	11 Missing and 9 partials ⚠️
src/tracksdata/attrs.py	72.72%	10 Missing and 2 partials ⚠️
src/tracksdata/graph/_rustworkx_graph.py	56.52%	8 Missing and 2 partials ⚠️
src/tracksdata/graph/_graph_view.py	66.66%	2 Missing ⚠️
src/tracksdata/nodes/_regionprops.py	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
- Coverage   88.18%   86.96%   -1.22%     
==========================================
  Files          56       56              
  Lines        4308     4665     +357     
  Branches      749      816      +67     
==========================================
+ Hits         3799     4057     +258     
- Misses        319      391      +72     
- Partials      190      217      +27     

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[yfukai]

Maybe I should save the data field-wise in SQLGraph. Let me experiment in this way.