Add datumaro binary format documentation

[vinnamkim]

Summary

• Ticket no. 104511
• Add datumaro.md and datumaro_binary.md to site/content/en/docs/formats/.
• Add notebooks/09_encrypt_dataset.ipynb

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

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Codecov Report

Patch coverage: 50.00% and project coverage change: -0.01 ⚠️

Comparison is base (fa7562c) 78.56% compared to head (ac1de81) 78.55%.

Additional details and impacted files

@@                Coverage Diff                 @@
##           releases/1.1.0     #880      +/-   ##
==================================================
- Coverage           78.56%   78.55%   -0.01%     
==================================================
  Files                 205      205              
  Lines               24949    24953       +4     
  Branches             5009     5011       +2     
==================================================
+ Hits                19601    19603       +2     
- Misses               4222     4223       +1     
- Partials             1126     1127       +1     

Flag	Coverage Δ
macos-11_Python-3.8	77.54% <50.00%> (-0.01%)	⬇️
ubuntu-20.04_Python-3.8	78.55% <50.00%> (-0.01%)	⬇️
windows-2019_Python-3.8	78.49% <50.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
...o/plugins/data_formats/datumaro_binary/exporter.py	96.03% <50.00%> (-1.90%)	⬇️

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[sooahleex]

Looks good to me. In my opinion, it seems better to add comments for Export to other formats like

Examples:
-Export dataset from datumaro to voc format:

[vinnamkim]

I updated it with the comments from @sooahleex and @JihwanEom and added some more detail guides for CLI dataset encryption usage.