Add method to find local free port

app/src/main/java/io/xpipe/app/util/HostHelper.java

@@ -1,9 +1,17 @@
 package io.xpipe.app.util;
 
+import java.io.IOException;
+import java.net.ServerSocket;
 import java.util.Locale;
 
 public class HostHelper {
 
+    public static int findRandomOpenPortOnAllLocalInterfaces() throws IOException {
+        try (ServerSocket socket = new ServerSocket(0)) {
+            return socket.getLocalPort();
+        }
+    }
+
     public static boolean isLocalHost(String host) {
         if (host.equals("127.0.0.1")) {
             return true;