Add support for coverage edges between spans and segmentation nodes

[thomaskrause]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 28 lines in your changes missing coverage. Please review.

Project coverage is 67.19%. Comparing base (781dd89) to head (bc93aad).
Report is 7 commits behind head on main.

Files	Patch %	Lines
graphannis/src/annis/db/example_generator.rs	89.74%	16 Missing and 4 partials ⚠️
graphannis/src/annis/db/aql/model.rs	88.88%	0 Missing and 6 partials ⚠️
cli/src/bin/annis.rs	0.00%	1 Missing ⚠️
graphannis/src/annis/db/corpusstorage.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #306      +/-   ##
==========================================
+ Coverage   66.93%   67.19%   +0.26%     
==========================================
  Files          77       77              
  Lines       18727    18931     +204     
  Branches    18727    18931     +204     
==========================================
+ Hits        12534    12720     +186     
- Misses       4726     4740      +14     
- Partials     1467     1471       +4     

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