Add Kaggle data supports

[wonjuleee]

Summary

How to test

Checklist

• 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

• 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

[codecov]

Codecov Report

Attention: 33 lines in your changes are missing coverage. Please review.

Comparison is base (b8c6b94) 80.49% compared to head (0b13690) 80.53%.

Files	Patch %	Lines
src/datumaro/plugins/data_formats/kaggle/base.py	86.97%	17 Missing and 14 partials ⚠️
src/datumaro/plugins/data_formats/mnist_csv.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1240      +/-   ##
===========================================
+ Coverage    80.49%   80.53%   +0.04%     
===========================================
  Files          269      270       +1     
  Lines        29991    30232     +241     
  Branches      5856     5898      +42     
===========================================
+ Hits         24140    24348     +208     
- Misses        4487     4506      +19     
- Partials      1364     1378      +14     

Flag	Coverage Δ
ubuntu-20.04_Python-3.8	80.52% <86.36%> (+0.04%)	⬆️
windows-2022_Python-3.8	80.50% <86.36%> (+0.04%)	⬆️

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[vinnamkim]

LGTM.

[jihyeonyi]

LGTM