graphview.bulk_add_edges actually uses ._root.bulk_add_edges

[TeunHuijben]

GraphView.bulk_add_edges called BaseGraph.bulk_add_edges, which actually looped over all edges to perform add_edge individually.

This PR changes that GraphView.bulk_add_edges actually uses ._root.bulk_add_edges, which is a lot faster (especially for on-disk SQL graphs on linux)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.29%. Comparing base (1564427) to head (8bf0d51).

Files with missing lines	Patch %	Lines
src/tracksdata/graph/_graph_view.py	72.72%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
- Coverage   87.34%   87.29%   -0.06%     
==========================================
  Files          56       56              
  Lines        4703     4713      +10     
  Branches      829      832       +3     
==========================================
+ Hits         4108     4114       +6     
- Misses        379      380       +1     
- Partials      216      219       +3     

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