Fix: handle JSON parse error in streaming tool calls

Signed-off-by: Minu Kim <kmw106933@naver.com>

Author: kmw10693

spring-ai-model/src/main/java/org/springframework/ai/model/tool/ToolOnFinishPredicate.java

@@ -0,0 +1,4 @@
+package org.springframework.ai.model.tool;
+
+public class ToolOnFinishPredicate {
+}