refactor: update MessageChatMemoryAdvisor instantiation to use builder pattern

Replace direct constructor usage with builder pattern for MessageChatMemoryAdvisor across multiple examples:
- ReflectionAgent in agents/reflection
- Application in model-context-protocol/sqlite/chatbot
- Application in model-context-protocol/web-search/brave-chatbot

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

model-context-protocol/sqlite/chatbot/src/main/java/org/springframework/ai/mcp/samples/sqlite/Application.java

@@ -35,7 +35,7 @@ public class Application {
 
 			var chatClient = chatClientBuilder
 					.defaultToolCallbacks(new SyncMcpToolCallbackProvider(mcpClients))
-					.defaultAdvisors(new MessageChatMemoryAdvisor(MessageWindowChatMemory.builder().build()))
+					.defaultAdvisors(MessageChatMemoryAdvisor.builder(MessageWindowChatMemory.builder().build()).build())
 					.build();
 
 			var scanner = new Scanner(System.in);