fix providers

Author: ilvalerione

src/Agent.php

@@ -220,7 +220,7 @@ private function getEventObservers(string $event = "*"): array
         return \array_merge($group, $all);
     }
 
-    public function attachListener(\SplObserver $observer, string $event = "*"): self
+    public function observe(\SplObserver $observer, string $event = "*"): self
     {
         $this->attach($observer, $event);
         return $this;

src/AgentInterface.php

@@ -28,5 +28,7 @@ public function resolveChatHistory(): AbstractChatHistory;
 
     public function withChatHistory(AbstractChatHistory $chatHistory): self;
 
+    public function observe(\SplObserver $observer, string $event = "*"): self;
+
     public function run(?Message $message = null): Message;
 }