Enhance import performance for built-in plugins

[vinnamkim]

Summary

• Ticket no. 112204
• Apply lazy import for built-in plugins (datumaro/components/lazy_plugin.py, datumaro/plugins/specs.py)
• Use DEFAULT_ENVIRONMENT rather than creating Environment() for CLI codes.
• Add openvino-dev to default extra deps and update contributing.md
• Decrease datum CLI latency by 1 sec (5 -> 4).

(before)

(datumaro) vinnamki@vinnamki:~/datumaro$ time datum -h
usage: datum [-h] [--version] [--loglevel LOGLEVEL]
...

real    0m5.052s
user    0m5.208s
sys     0m3.363s

(after)

(datumaro) vinnamki@vinnamki:~/datumaro$ time datum -h
usage: datum [-h] [--version] [--loglevel LOGLEVEL]
...

real    0m3.955s
user    0m4.323s
sys     0m3.172s

How to test

I added a test for this change.

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-commenter]

Codecov Report

Patch coverage: 80.50% and project coverage change: +0.11 🎉

Comparison is base (5f8f9a3) 78.74% compared to head (3c71796) 78.86%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1031      +/-   ##
===========================================
+ Coverage    78.74%   78.86%   +0.11%     
===========================================
  Files          237      239       +2     
  Lines        27097    27178      +81     
  Branches      5407     5418      +11     
===========================================
+ Hits         21338    21433      +95     
+ Misses        4497     4480      -17     
- Partials      1262     1265       +3     

Flag	Coverage Δ
macos-11_Python-3.8	?
ubuntu-20.04_Python-3.8	78.85% <80.50%> (+0.12%)	⬆️
windows-2019_Python-3.8	78.75% <80.50%> (+0.12%)	⬆️

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

Impacted Files	Coverage Δ
datumaro/cli/commands/convert.py	20.96% <25.00%> (ø)
datumaro/cli/commands/download.py	17.85% <33.33%> (ø)
...o/cli/commands/require_project/modification/add.py	21.66% <33.33%> (ø)
...li/commands/require_project/modification/export.py	23.94% <33.33%> (ø)
...i/commands/require_project/modification/import_.py	20.89% <33.33%> (ø)
datumaro/cli/commands/transform.py	19.04% <33.33%> (ø)
datumaro/cli/commands/detect_format.py	21.42% <50.00%> (ø)
datumaro/cli/commands/merge.py	21.17% <50.00%> (ø)
datumaro/cli/commands/patch.py	26.92% <50.00%> (ø)
datumaro/cli/commands/validate.py	19.17% <50.00%> (ø)
... and 7 more

... and 4 files with indirect coverage changes

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[vinnamkim]

d8f1fd0 added extra_deps mechanism to the lazy plugin import. It requires for the system who doesn't have extra deps for some plugins. Without this, that system terminates with ImportError when trying to import a lazy plugin.