Added before/after detail of group member role update event

Author: Thomasr

server/api-service/lowcoder-infra/src/main/java/org/lowcoder/infra/event/groupmember/GroupMemberRoleUpdateEvent.java

@@ -10,6 +10,7 @@ public class GroupMemberRoleUpdateEvent extends BaseGroupMemberEvent {
     private final String memberId;
     private final String memberName;
     private final String memberRole;
+    private final String oldMemberRole;
 
     @Override
     public EventType getEventType() {

server/api-service/lowcoder-server/src/main/java/org/lowcoder/api/util/BusinessEventPublisher.java

@@ -585,7 +585,8 @@ public Mono<Void> publishGroupMemberRoleUpdateEvent(boolean publish, String grou
                                     .groupName(group.getName(locale))
                                     .memberId(member.getId())
                                     .memberName(member.getName())
-                                    .memberRole(previousGroupMember.getRole().getValue() + " => " + updateRoleRequest.getRole())
+                                    .memberRole(updateRoleRequest.getRole())
+                                    .oldMemberRole(previousGroupMember.getRole().getValue())
                                     .isAnonymous(Authentication.isAnonymousUser(orgMember.getUserId()))
                                     .sessionHash(Hashing.sha512().hashString(tuple.getT4(), StandardCharsets.UTF_8).toString())
                                     .build();