Use importlib from system

[kumare3]

Summary by Bito

• This pull request updates the import statements in the plugin configuration file to ensure compatibility with different Python versions.
• It introduces conditional imports for `entry_points` based on the Python version, enhancing the code's robustness.
• The changes improve maintainability and robustness of the codebase by allowing it to adapt based on the Python version in use.
• Overall, these changes contribute to a more flexible codebase.
• Overall, the changes improve the maintainability of the codebase.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.22%. Comparing base (c3818b3) to head (556bd90).

❗ There is a different number of reports uploaded between BASE (c3818b3) and HEAD (556bd90). Click for more details.

HEAD has 68 uploads less than BASE

Flag	BASE (c3818b3)	HEAD (556bd90)
	71	3

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3351      +/-   ##
==========================================
- Coverage   83.86%   76.22%   -7.65%     
==========================================
  Files         325      216     -109     
  Lines       28280    22700    -5580     
  Branches     2974     2975       +1     
==========================================
- Hits        23717    17302    -6415     
- Misses       3712     4538     +826     
- Partials      851      860       +9     

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