Add Ultralytics YOLO format

[vinnamkim]

Summary

• Ticket no. 104512
• Add YoloUltralyticsImport and YoloUltralyticsExporter.
• Add documentation for YoloUltralytics format.
• Add E2E example from the dataset conversion to the model training using YoloV8-Ultralytics trainer, notebooks/08_e2e_example_yolo_ultralytics_trainer.ipynb.

How to test

Add a test to cover this change.

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below)

# Copyright (C) 2023 Intel Corporation
#
# SPDX-License-Identifier: MIT

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Codecov Report

Patch coverage: 80.59% and project coverage change: -0.04 ⚠️

Comparison is base (36c2d4b) 78.59% compared to head (51c8112) 78.55%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #859      +/-   ##
===========================================
- Coverage    78.59%   78.55%   -0.04%     
===========================================
  Files          201      201              
  Lines        24534    24640     +106     
  Branches      4957     4976      +19     
===========================================
+ Hits         19282    19356      +74     
- Misses        4141     4169      +28     
- Partials      1111     1115       +4     

Flag	Coverage Δ
macos-11_Python-3.8	77.90% <80.59%> (-0.04%)	⬇️
ubuntu-20.04_Python-3.8	78.54% <80.59%> (-0.04%)	⬇️
windows-2019_Python-3.8	78.48% <80.59%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
datumaro/plugins/data_formats/yolo/exporter.py	71.64% <76.92%> (-8.00%)	⬇️
datumaro/plugins/data_formats/yolo/base.py	87.56% <89.47%> (+0.06%)	⬆️
datumaro/plugins/data_formats/yolo/format.py	100.00% <100.00%> (ø)
datumaro/plugins/data_formats/yolo/importer.py	84.61% <100.00%> (+3.22%)	⬆️

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[wonjuleee]

LGTM!