feat: 全新智能体功能

- 基于先进智能体框架，增加智能体编排功能
- 增加智能体聊天，并对接持久化

easyflow-modules/easyflow-module-approval/src/main/java/tech/easyflow/approval/enums/ApprovalResourceType.java

@@ -11,6 +11,7 @@ import java.util.stream.Collectors;
 public enum ApprovalResourceType {
 
     BOT("BOT"),
+    AGENT("AGENT"),
     WORKFLOW("WORKFLOW"),
     KNOWLEDGE("KNOWLEDGE");