Add password support for Redis backend (#79)

Co-authored-by: k1dave6412 <14539608+k1dave6412@users.noreply.github.com>

Author: Kludex

broadcaster/_backends/redis.py

@@ -12,10 +12,12 @@ def __init__(self, url: str):
         parsed_url = urlparse(url)
         self._host = parsed_url.hostname or "localhost"
         self._port = parsed_url.port or 6379
+        self._password = parsed_url.password or None
 
     async def connect(self) -> None:
-        self._pub_conn = await asyncio_redis.Connection.create(self._host, self._port)
-        self._sub_conn = await asyncio_redis.Connection.create(self._host, self._port)
+        kwargs = {"host": self._host, "port": self._port, "password": self._password}
+        self._pub_conn = await asyncio_redis.Connection.create(**kwargs)
+        self._sub_conn = await asyncio_redis.Connection.create(**kwargs)
         self._subscriber = await self._sub_conn.start_subscribe()
 
     async def disconnect(self) -> None: