feat: add @vant/compat package (#10806)

* feat: add @vant/compat package

* chore: remove prepare script

packages/vant-compat/src/toast.ts

@@ -0,0 +1,49 @@
+import {
+  showToast,
+  closeToast,
+  showFailToast,
+  showSuccessToast,
+  allowMultipleToast,
+  setToastDefaultOptions,
+  resetToastDefaultOptions,
+} from 'vant';
+import type { App } from 'vue';
+
+export const Toast = (...args: Parameters<typeof showToast>) => {
+  const toast = showToast(...args);
+  return {
+    clear: toast.close,
+    ...toast,
+  };
+};
+
+Toast.fail = (...args: Parameters<typeof showFailToast>) => {
+  const toast = showFailToast(...args);
+  return {
+    clear: toast.close,
+    ...toast,
+  };
+};
+
+Toast.success = (...args: Parameters<typeof showSuccessToast>) => {
+  const toast = showSuccessToast(...args);
+  return {
+    clear: toast.close,
+    ...toast,
+  };
+};
+
+Toast.clear = closeToast;
+Toast.allowMultiple = allowMultipleToast;
+Toast.setDefaultOptions = setToastDefaultOptions;
+Toast.resetDefaultOptions = resetToastDefaultOptions;
+
+Toast.install = (app: App) => {
+  app.config.globalProperties.$toast = Toast;
+};
+
+declare module '@vue/runtime-core' {
+  interface ComponentCustomProperties {
+    $toast: typeof Toast;
+  }
+}