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Leverage terser to mangle/compress the generated js messages (#1086)

This patch implements to leverage [terser](https://www.npmjs.com/package/terser) to mangle/compress the generated `.js`  messages when  `--debug` option not added. If debugging the message files, users can run `generate-messages:dev` to check with the original files, including:

1. Removing the prettier dependency.
2. Integrating terser minification with error handling for JavaScript files.
3. Using a conditional debug flag (isDebug) to determine whether to minify the code.
4. Don't remove the blank line in the generated files because it will be handled by `terser` now.

Fix: #1085

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