Change toolCallingManager visibility to protected

Allows subclasses of ToolCallAdvisor to access the toolCallingManager field.

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>

Author: tzolov

spring-ai-client-chat/src/main/java/org/springframework/ai/chat/client/advisor/ToolCallAdvisor.java

@@ -46,7 +46,7 @@
  */
 public class ToolCallAdvisor implements CallAdvisor, StreamAdvisor {
 
-	private final ToolCallingManager toolCallingManager;
+	protected final ToolCallingManager toolCallingManager;
 
 	/**
 	 * Set the order close to {@link Ordered#LOWEST_PRECEDENCE} to ensure an advisor is