Include corpus size in corpus config and corpus statistics

[thomaskrause]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.00000% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 66.88%. Comparing base (a7d40f0) to head (3bea3c6). Report is 1 commits behind head on main.

Files	Patch %	Lines
core/src/util/example_graphs.rs	77.39%	0 Missing and 26 partials :warning:
graphannis/src/annis/db/corpusstorage.rs	80.00%	7 Missing and 3 partials :warning:
graphannis/src/annis/db/aql/model.rs	83.33%	1 Missing and 5 partials :warning:
core/src/graph/mod.rs	50.00%	0 Missing and 1 partial :warning:
core/src/graph/storage/linear.rs	66.66%	0 Missing and 1 partial :warning:
core/src/graph/storage/prepost.rs	66.66%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #294      +/-   ##
==========================================
- Coverage   67.02%   66.88%   -0.15%     
==========================================
  Files          76       77       +1     
  Lines       19415    18675     -740     
  Branches    19415    18675     -740     
==========================================
- Hits        13013    12490     -523     
+ Misses       4991     4727     -264     
- Partials     1411     1458      +47     

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