fix(aio-pika): Accept message & routing_key as either positional or kw args

Signed-off-by: Varsha GS <[email protected]>

Author: GSVarsha

src/instana/instrumentation/aio_pika.py

@@ -51,11 +51,15 @@ async def publish_with_instana(
             "rabbitmq", span_context=parent_context
         ) as span:
             connection = instance.channel._connection
+            message = kwargs["message"] if kwargs.get("message") else args[0]
+            routing_key = (
+                kwargs["routing_key"] if kwargs.get("routing_key") else args[1]
+            )
+
             _extract_span_attributes(
-                span, connection, "publish", kwargs["routing_key"], instance.name
+                span, connection, "publish", routing_key, instance.name
             )
 
-            message = args[0]
             tracer.inject(
                 span.context,
                 Format.HTTP_HEADERS,