feat: Support for conversational streaming (#809)

### What problem does this PR solve?

feat: Support for conversational streaming
#709

### Type of change


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

web/src/interfaces/database/chat.ts

@@ -72,6 +72,11 @@ export interface IReference {
   total: number;
 }
 
+export interface IAnswer {
+  answer: string;
+  reference: IReference;
+}
+
 export interface Docagg {
   count: number;
   doc_id: string;