Add hierarchical ImageNet-like dataset format

[itrushkin]

Summary

CVS-143460

How to test

Checklist

• [x] I have added unit tests to cover my changes.​
• [ ] I have added integration tests to cover my changes.​
• [ ] I have added the description of my changes into CHANGELOG.​
• [ ] I have updated the documentation accordingly

License

• [x] 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) 2024 Intel Corporation
#
# SPDX-License-Identifier: MIT

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.00000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 81.04%. Comparing base (44cc56a) to head (f24ea6e). Report is 90 commits behind head on develop.

Files	Patch %	Lines
src/datumaro/plugins/data_formats/imagenet.py	78.72%	3 Missing and 7 partials :warning:
src/datumaro/plugins/data_formats/image_dir.py	83.33%	1 Missing and 2 partials :warning:
src/datumaro/plugins/data_formats/yolo/exporter.py	50.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1528 +/- ## =========================================== + Coverage 80.85% 81.04% +0.18% =========================================== Files 271 276 +5 Lines 30689 32395 +1706 Branches 6197 6586 +389 =========================================== + Hits 24815 26255 +1440 - Misses 4489 4688 +199 - Partials 1385 1452 +67 ``` | [Flag](https://app.codecov.io/gh/openvinotoolkit/datumaro/pull/1528/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openvinotoolkit) | Coverage Δ | | |---|---|---| | [ubuntu-20.04_Python-3.10](https://app.codecov.io/gh/openvinotoolkit/datumaro/pull/1528/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openvinotoolkit) | `81.03% <80.00%> (+0.19%)` | :arrow_up: | | [windows-2022_Python-3.10](https://app.codecov.io/gh/openvinotoolkit/datumaro/pull/1528/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openvinotoolkit) | `81.02% <80.00%> (+0.19%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openvinotoolkit#carryforward-flags-in-the-pull-request-comment) to find out more.

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