feat: Enhance real-time collaboration features with user awareness and document sharing

- Added user information (UserID, UserName, UserAvatar) to Client struct for presence tracking.
- Implemented failure handling in the broadcastMessage function to manage send failures and disconnect clients if necessary.
- Introduced document ownership and sharing capabilities:
  - Added OwnerID and Is_Public fields to Document model.
  - Created DocumentShare model for managing document sharing with permissions.
  - Implemented functions for creating, listing, and managing document shares in the Postgres store.
- Added user management functionality:
  - Created User model and associated functions for user management in the Postgres store.
  - Implemented session management with token hashing for security.
- Updated database schema with migrations for users, sessions, and document shares.
- Enhanced frontend Yjs integration with awareness event logging for user connections and disconnections.

frontend/src/lib/yjs.ts

@@ -1,4 +1,5 @@
 import { IndexeddbPersistence } from "y-indexeddb";
+import { Awareness } from "y-protocols/awareness";
 import { WebsocketProvider } from "y-websocket";
 import * as Y from "yjs";
 import { documentsApi } from "../api/document";
@@ -9,7 +10,7 @@ export interface YjsProviders {
   ydoc: Y.Doc;
   websocketProvider: WebsocketProvider;
   indexeddbProvider: IndexeddbPersistence;
-  awareness: any;
+  awareness: Awareness;
 }
 
 export const createYjsDocument = async (documentId: string): Promise<YjsProviders> => {