Returning geff metadata and adding geff_read_kwargs

[JoOkuma]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.94%. Comparing base (af26e1c) to head (accfedd).

Files with missing lines	Patch %	Lines
src/tracksdata/graph/_base_graph.py	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #172      +/-   ##
==========================================
- Coverage   87.97%   87.94%   -0.03%     
==========================================
  Files          50       50              
  Lines        3392     3394       +2     
  Branches      581      582       +1     
==========================================
+ Hits         2984     2985       +1     
  Misses        246      246              
- Partials      162      163       +1     

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