adding sorting of conversations

packages/api/services/conversation.service.ts

@@ -7,10 +7,19 @@ export default class ConversationService {
     return await collections.conversations?.insertOne(newConversation);
   }
 
+  /**
+   *
+   * @param userId
+   * @returns all conversations for user
+   * sorted by lastActivityDate descending
+   */
   static async getAllConversationsForUser(userId: string) {
     const query = { 'members._id': new ObjectId(userId) };
 
-    const res = await collections.conversations?.find(query).toArray();
+    const res = await collections.conversations
+      ?.find(query)
+      .sort({ lastActivityDate: -1 })
+      .toArray();
 
     // exists
     if (res?.length) {