feat: add typescript support to prettier-plugin-java

Author: ntnyq

packages/prettier-plugin-java/index.d.ts

@@ -0,0 +1,4 @@
+import type { Plugin } from "prettier";
+
+declare const plugin: Plugin;
+export default plugin;

packages/prettier-plugin-java/package.json

@@ -3,9 +3,15 @@
   "version": "2.6.5",
   "description": "Prettier Java Plugin",
   "type": "module",
-  "exports": "./dist/index.js",
+  "exports": {
+    ".": {
+      "types": "./index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
   "files": [
-    "dist"
+    "dist",
+    "index.d.ts"
   ],
   "homepage": "https://jhipster.github.io/prettier-java/",
   "repository": "https://github.com/jhipster/prettier-java",