Multiple Improvements

[liushuyu]

This pull request makes multiple improvements to the scripted GitHub Actions in this repository.

• Switch to recommended Node.js 18 TypeScript configuration provided by TypeScript upstream
• Updated the NPM packages to their latest versions to fix several security issues
• Replaced @vercel/ncc with esbuild for better bundling results (better tree-shaking and better build times)
• Use proper private member sigil in the code (see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/Private_properties)
• Switch to Node.js 20 runtime to suppress deprecation warnings

[liushuyu]

Note that the generated files under dist/ have not been modified. It's recommended that the person who merges this pull request generate the files on their own device to ensure safety.