Generate runtime options file using Babel

Previously runtime options were generated using manually created AST
nodes and `astring` module. This was hindersome to maintain, so I
decided to switch to using recast at first, but quickly found it doesn't
support some of AST types that we need, so I've migrated to Babel
modules instead, which provide all the nice APIs and generate more
correct code than recast.

.changeset/tough-horses-chew.md

@@ -0,0 +1,5 @@
+---
+'@vintl/nuxt': patch
+---
+
+Switch to Babel for runtime options generation

packages/vintl-nuxt/package.json

@@ -49,6 +49,7 @@
     "@nuxt/eslint-config": "^0.6.0",
     "@nuxt/module-builder": "^0.8.4",
     "@nuxt/schema": "^3.13.2",
+    "@types/babel__generator": "^7.6.8",
     "@types/hash-sum": "^1.0.2",
     "@types/node": "^18.19.56",
     "@vintl-dev/eslint-config-peony": "workspace:^",
@@ -57,12 +58,13 @@
     "vue-tsc": "^2.1.6"
   },
   "dependencies": {
+    "@babel/generator": "^7.25.9",
+    "@babel/types": "^7.25.9",
     "@formatjs/intl": "^2.10.8",
     "@formatjs/intl-localematcher": "^0.5.5",
     "@nuxt/kit": "^3.13.2",
     "@vintl/unplugin": "^2.0.0",
     "@vintl/vintl": "^4.4.1",
-    "astring": "^1.9.0",
     "consola": "^3.2.3",
     "hash-sum": "^2.0.0",
     "import-meta-resolve": "^4.1.0",