feat(client): add close() method to server

src/Client.js

@@ -187,14 +187,17 @@ export class Client extends EventEmitter {
     }
 
     listen(port, callback) {
-        this.on('raw', container => {
+        const listener = container => {
             if(container.message === 'Message') {
                 const message = Message.toObject(container.Message, { longs: String })
                 callback(BigInt(message.address), message.data)
             }
-        })
+        }
+
+        this.on('raw', listener)
 
         return {
+            close: () => this.removeListener('raw', listener),
             publish: flags => this.#publish(port, flags),
             unpublish: flags => this.#unpublish(port)
         }