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 78.34101% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.32%. Comparing base (a4f7607) to head (5e7331f).

Files with missing lines	Patch %	Lines
src/tracksdata/graph/_sql_graph.py	84.67%	12 Missing and 9 partials ⚠️
src/tracksdata/attrs.py	72.72%	10 Missing and 2 partials ⚠️
src/tracksdata/graph/_rustworkx_graph.py	41.17%	8 Missing and 2 partials ⚠️
src/tracksdata/utils/_dtypes.py	78.94%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
- Coverage   87.75%   87.32%   -0.43%     
==========================================
  Files          57       57              
  Lines        4947     5122     +175     
  Branches      872      913      +41     
==========================================
+ Hits         4341     4473     +132     
- Misses        381      412      +31     
- Partials      225      237      +12     

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[yfukai]

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

[JoOkuma]

@yfukai, let me know when this is ready for review.

[yfukai]

Thanks, it might take a while, but I'll continue working on this.

[yfukai]

@JoOkuma I believe this is good to go! Sorry for the large PR.

[JoOkuma]

@yfukai, I need more time to take a look at your PRs. I'll try to get them done before the end of the week.

[yfukai]

Added additional comments! It would be great if you could review this, since this changes the database structure for a "struct"-type attributes @JoOkuma