Add simplified constructor to EvaluationRequest

- Add new constructor EvaluationRequest(String userText, String responseContent)
- New constructor uses Collections.emptyList() for dataList

spring-ai-core/src/main/java/org/springframework/ai/evaluation/EvaluationRequest.java

@@ -2,6 +2,7 @@ package org.springframework.ai.evaluation;
 
 import org.springframework.ai.model.Content;
 
+import java.util.Collections;
 import java.util.List;
 import java.util.Objects;
 
@@ -21,6 +22,10 @@ public class EvaluationRequest {
 
 	private final String responseContent;
 
+	public EvaluationRequest(String userText, String responseContent) {
+		this(userText, Collections.emptyList(), responseContent);
+	}
+
 	public EvaluationRequest(String userText, List<Content> dataList, String responseContent) {
 		this.userText = userText;
 		this.dataList = dataList;