Added authentication support for AQMP broker url

changelog/8057.improvement.md

@@ -0,0 +1,2 @@
+Added authentication support for connecting to external rabbitMQ server.
+Currently user has to pass a username and password hardcoded url inorder to connect to external rabbitMQ.

rasa/core/brokers/pika.py

@@ -6,6 +6,7 @@
 from asyncio import AbstractEventLoop
 from collections import deque
 from typing import Deque, Dict, Optional, Text, Union, Any, List, Tuple
+from urllib.parse import urlparse
 
 import aio_pika
 
@@ -168,7 +169,9 @@ async def _connect(self) -> aio_pika.RobustConnection:
         # The `url` parameter will take precedence over parameters like `login` or
         # `password`.
         if self.host.startswith("amqp"):
-            url = self.host
+
+            parsed_host = urlparse(self.host)
+            url = f"{parsed_host.scheme}://{self.username}:{self.password}@{parsed_host.netloc}:{self.port}"
 
         ssl_options = _create_rabbitmq_ssl_options(self.host)
         logger.info("Connecting to RabbitMQ ...")