feature: `intlify transform`

[kazupon]

Clear and concise description of the problem

related from
nuxt-modules/i18n#1481 (comment)

If we are already using vue-i18n v8 and operating with the localize service, we will need to convert your resource format to vue-i18n v9 because it is incompatible.

• special characters
  https://vue-i18n.intlify.dev/guide/essentials/syntax.html#special-characters

Suggested solution

We suggestion a new command transform to convert the resource from vue-i18n v8 to v9.

By providing this command, it is also possible to convert in a CI environment such as github actions.

Alternative

No response

Additional context

No response

Validations

• Read the Contributing Guidelines
• Read the Documentation
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.

[yaolinhong]

This feature seems necessary

We are temporarily using this project to compile Chinese content. The conversion results are not fully compatible with the latest version vue-i18n.