feat: add @vant/area-data package (#8490)

packages/vant-area-data/README.md

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+# Vant Area Data
+
+省市区数据，适用于 Vant Area 组件。
+
+## 安装
+
+#### NPM
+
+```shell
+npm i @vant/area-data -D
+```
+
+#### YARN
+
+```shell
+yarn add @vant/area-data --dev
+```
+
+## 使用
+
+```ts
+import { areaList } from '@vant/area-data';
+```

packages/vant-area-data/package.json

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+{
+  "name": "@vant/area-data",
+  "version": "1.0.0",
+  "description": "Vant 省市区数据",
+  "main": "lib/index.js",
+  "publishConfig": {
+    "access": "public",
+    "registry": "https://registry.npmjs.org/"
+  },
+  "scripts": {
+    "build": "tsc",
+    "release": "yarn build && npm publish"
+  },
+  "license": "MIT",
+  "repository": "https://github.com/youzan/vant"
+}

packages/vant-area-data/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2019",
+    "outDir": "./lib",
+    "module": "commonjs",
+    "strict": true,
+    "declaration": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "lib": ["esnext"]
+  },
+  "include": ["src/**/*"]
+}