add modify conversation api

pkg/base_info/conversation_api_struct.go

@@ -58,6 +58,15 @@ type SetConversationReq struct {
 type SetConversationResp struct {
 	CommResp
 }
+type ModifyConversationFieldReq struct {
+	Conversation
+	FieldType   int32    `json:"fieldType" binding:"required"`
+	UserIDList  []string `json:"userIDList" binding:"required"`
+	OperationID string   `json:"operationID" binding:"required"`
+}
+type ModifyConversationFieldResp struct {
+	CommResp
+}
 
 type BatchSetConversationsReq struct {
 	Conversations    []Conversation `json:"conversations" binding:"required"`