Support to ECMAScript modules with mjs file extension

[peng]

PR Details

• Change require to import.
• Add script and change file place in package.json.
• Add lock file to lock version

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.65%. Comparing base (2d569af) to head (6feeed7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   98.46%   98.65%   +0.19%     
==========================================
  Files           1        1              
  Lines        2992     2604     -388     
==========================================
- Hits         2946     2569     -377     
+ Misses         35       24      -11     
  Partials       11       11              

Flag	Coverage Δ
unittests	98.65% <100.00%> (+0.19%)	⬆️

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[xuri]

LGTM, thanks for your contribution.