Feat: Users can chat directly without first creating a conversation. #11768 (#11769)

### What problem does this PR solve?

Feat: Users can chat directly without first creating a conversation.
#11768
### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/interfaces/database/chat.ts

@@ -187,6 +187,7 @@ export interface IExternalChatInfo {
 export interface IMessage extends Message {
   id: string;
   reference?: IReference; // the latest news has reference
+  conversationId?: string; // To distinguish which conversation the message belongs to
 }
 
 export interface IClientConversation extends IConversation {