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

• [x] 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 :white_check_mark:

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

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/xuri/excelize-wasm/pull/21/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xuri) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/xuri/excelize-wasm/pull/21/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xuri) | `98.65% <100.00%> (+0.19%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xuri#carryforward-flags-in-the-pull-request-comment) to find out more.

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