feat(plugins): use @tauri-apps namespace on NPM (#368)

Co-authored-by: Amr Bashir <amr.bashir2015@gmail.com>

plugins/authenticator/README.md

@@ -53,7 +53,7 @@ fn main() {
 Afterwards all the plugin's APIs are available through the JavaScript guest bindings:
 
 ```javascript
-import { Authenticator } from "tauri-plugin-authenticator-api";
+import { Authenticator } from "@tauri-apps/plugin-authenticator";
 
 const auth = new Authenticator();
 auth.init(); // initialize transports

plugins/authenticator/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "tauri-plugin-authenticator-api",
+  "name": "@tauri-apps/plugin-authenticator",
   "version": "0.0.0",
   "description": "Use hardware security-keys in your Tauri App.",
   "license": "MIT or APACHE-2.0",