Add data explorer feature

[sooahleex]

Summary

How to test

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) 2021 Intel Corporation
#
# SPDX-License-Identifier: MIT

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[bonhunko]

I left some minor reviews.

[vinnamkim]

Please turn on CI green first.

[bonhunko]

LGTM! thank you!

[codecov-commenter]

Codecov Report

Base: 83.93% // Head: 83.33% // Decreases project coverage by -0.60% ⚠️

Coverage data is based on head (efddbc7) compared to base (3aa4742).
Patch coverage: 29.13% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #773      +/-   ##
===========================================
- Coverage    83.93%   83.33%   -0.60%     
===========================================
  Files          174      179       +5     
  Lines        22941    23236     +295     
  Branches      4973     5022      +49     
===========================================
+ Hits         19255    19364     +109     
- Misses        2559     2743     +184     
- Partials      1127     1129       +2     

Flag	Coverage Δ
macos-11_Python-3.10	?
macos-11_Python-3.7	82.90% <29.13%> (-0.63%)	⬇️
macos-11_Python-3.8	83.18% <29.23%> (-0.60%)	⬇️
macos-11_Python-3.9	83.19% <29.23%> (-0.60%)	⬇️
ubuntu-20.04_Python-3.10	83.25% <29.13%> (-0.60%)	⬇️
ubuntu-20.04_Python-3.7	82.91% <29.13%> (-0.63%)	⬇️
ubuntu-20.04_Python-3.8	83.19% <29.23%> (-0.60%)	⬇️
ubuntu-20.04_Python-3.9	83.20% <29.23%> (-0.60%)	⬇️
windows-2019_Python-3.10	83.21% <29.13%> (-0.61%)	⬇️
windows-2019_Python-3.7	82.86% <29.13%> (-0.64%)	⬇️
windows-2019_Python-3.8	83.13% <29.23%> (-0.60%)	⬇️
windows-2019_Python-3.9	83.15% <29.23%> (-0.60%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datumaro/cli/__main__.py	88.77% <ø> (ø)
datumaro/cli/commands/__init__.py	100.00% <ø> (ø)
datumaro/components/hl_ops.py	63.93% <0.00%> (ø)
datumaro/components/searcher.py	13.63% <13.63%> (ø)
datumaro/plugins/searcher.py	20.18% <20.18%> (ø)
datumaro/components/dataset.py	82.33% <33.33%> (-0.68%)	⬇️
...ns/openvino_plugin/samples/clip_ViT-B_32_interp.py	42.85% <42.85%> (ø)
datumaro/cli/commands/search.py	44.44% <44.44%> (ø)
datumaro/util/samples.py	50.00% <50.00%> (ø)
datumaro/components/launcher.py	71.66% <69.23%> (-2.34%)	⬇️
... and 4 more

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