Chore: Add type files and unit test ci for Node.js SDK (#2268)

Co-authored-by: xieweicheng <xieweicheng@bytedance.com>

sdks/nodejs-client/package.json

@@ -1,9 +1,10 @@
 {
   "name": "dify-client",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "description": "This is the Node.js SDK for the Dify.AI API, which allows you to easily integrate Dify.AI into your Node.js applications.",
   "main": "index.js",
   "type": "module",
+  "types":"index.d.ts",
   "keywords": [
     "Dify",
     "Dify.AI",