Tests for evaluate script

[sfmig]

Rebase after #172 is merged.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 8.86076% with 72 lines in your changes missing coverage. Please review.

Project coverage is 36.53%. Comparing base (4e70c2c) to head (e87a57c).

Files	Patch %	Lines
crabs/detection_tracking/evaluate_model.py	0.00%	71 Missing ⚠️
crabs/detection_tracking/visualization.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
- Coverage   37.75%   36.53%   -1.23%     
==========================================
  Files          20       20              
  Lines        1348     1404      +56     
==========================================
+ Hits          509      513       +4     
- Misses        839      891      +52     

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[sfmig]

Closing because:

• edits to visualisation and visualisation tests have been covered in PR220
  • remaining bits are covered in Fix draw_detection to work with batch_size > 1 #232
• other changes (such as config update) have also been implemented separately
• the branch is outdated for the skeleton tests added to be worth keeping