Evaluate script: review of command-line arguments

[sfmig]

• Use datamodule/dataset from checkpoint if not specified:
  evaluate-detector --checkpoint_path /path/to/ml-runs/612070585685391606/b640975fb8d74ee4ac07f05908cb3350/checkpoints/last.ckpt --accelerator cpu

• Split config into sections

• CLI arg iou_threshold was not being used (config instead)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 44 lines in your changes are missing coverage. Please review.

Project coverage is 36.18%. Comparing base (7362430) to head (03b6664).

Files	Patch %	Lines
crabs/detection_tracking/evaluate_model.py	0.00%	44 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #172      +/-   ##
==========================================
- Coverage   37.18%   36.18%   -1.00%     
==========================================
  Files          19       19              
  Lines        1307     1343      +36     
==========================================
  Hits          486      486              
- Misses        821      857      +36     

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