feat: RND-116: YOLOv8 ML Backend

[makseq]

See README.md in label_studio_ml/examples/yolo folder.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 84.99157% with 89 lines in your changes missing coverage. Please review.

Project coverage is 67.24%. Comparing base (7f46c1a) to head (5f7b240).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
label_studio_ml/examples/yolo/_wsgi.py	20.68%	46 Missing ⚠️
label_studio_ml/utils.py	7.14%	13 Missing ⚠️
...bel_studio_ml/examples/yolo/control_models/base.py	89.61%	8 Missing ⚠️
...ml/examples/yolo/control_models/keypoint_labels.py	92.20%	6 Missing ⚠️
...amples/yolo/control_models/rectangle_labels_obb.py	92.85%	3 Missing ⚠️
...ml/examples/yolo/control_models/video_rectangle.py	97.39%	3 Missing ⚠️
label_studio_ml/examples/yolo/model.py	95.38%	3 Missing ⚠️
..._studio_ml/examples/yolo/control_models/choices.py	95.23%	2 Missing ⚠️
label_studio_ml/model.py	92.59%	2 Missing ⚠️
..._ml/examples/yolo/control_models/polygon_labels.py	96.96%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #607       +/-   ##
===========================================
+ Coverage   47.72%   67.24%   +19.52%     
===========================================
  Files          40       21       -19     
  Lines        2703     1319     -1384     
===========================================
- Hits         1290      887      -403     
+ Misses       1413      432      -981     

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