Add script to spot differences in liquid tags (#22962)

* Add script to spot differences in liquid tags

It compares source and translation

Usage example:

```bash
script/i18n/liquid-diff.js {files} --language=es
```

Author: mjacobus

script/i18n/liquid-diff.js

@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+
+import program from 'commander'
+import { compareLiquidTags } from '../../lib/liquid-tags/tokens.js'
+import languages from '../../lib/languages.js'
+
+program
+  .argument('<files...>', 'The file name(s) without the language dir. \nI.E. content/foo.md')
+  .description('Shows the differences of liquid tags between two files')
+  .requiredOption('-l, --language <language>', `Choose one of these languages to compare: ${Object.keys(languages).filter(l => l !== 'en')}`)
+  .parse(process.argv)
+
+function reportFileDifference(diff) {
+  console.log(`File: ${diff.file}`)
+  console.log(`Translation: ${diff.translation}`)
+  console.log(`Differences:`)
+  console.log(diff.diff.output)
+}
+
+function main() {
+  const files = program.args
+  const options = program.opts()
+
+  files.forEach((file) => {
+    const language = languages[options.language]
+    if (!language) throw new Error(`${options.language} is not a recognized language`)
+    const diff = compareLiquidTags(file, language)
+    reportFileDifference(diff)
+  })
+}
+
+main()