Add ground truth tracking video

[nikk-nikaznan]

• Refactor some function - both dict function (get_ground_truth_data and get_predicted_data) moved to utils (tracking)
• Add save ground truth tracking to video output when gt_path is given for #209
• Add some tests for save_required_output and save_required_output

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.68750% with 13 lines in your changes missing coverage. Please review.

Project coverage is 47.71%. Comparing base (f46e362) to head (2e1553d).

Files	Patch %	Lines
crabs/tracker/track_video.py	12.50%	7 Missing :warning:
crabs/tracker/utils/io.py	45.45%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #216 +/- ## ========================================== + Coverage 46.68% 47.71% +1.03% ========================================== Files 24 24 Lines 1476 1486 +10 ========================================== + Hits 689 709 +20 + Misses 787 777 -10 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.