Enhances: support ESM and CommonJS

[jeff-tbd]

Self Checklist

• I wrote a PR title in English and added an appropriate label to the PR.
• I wrote the commit message in English and to follow the Conventional Commits specification.
• I wrote or updated documentation related to the changes. (or didn't have to)
• I wrote or updated tests related to the changes. (or didn't have to)
• I tested the changes in various browsers. (or didn't have to)
  • Windows: Chrome, Edge, (Optional) Firefox
  • macOS: Chrome, Edge, Safari, (Optional) Firefox
  • Android: Chrome, Samsung Internet
  • iOS: Safari, Chrome,

Related Issue

Summary

• Support ESM and CommonJS

Details

• fix package.json
  • Remove unnecessary settings in the package.json files field entry (README)
  • Apply conditional exports

Breaking change? (Yes/No)

• No

References

• https://nodejs.org/api/packages.html#exports
• https://toss.tech/article/commonjs-esm-exports-field