Feat/notifcation

[hussein-saad]

This pull request introduces real-time notification functionality to the chat system by integrating the NotificationService with the ChatGateway. Key changes include managing user connections, enabling real-time notification delivery, and ensuring module dependencies are properly configured.

Enhancements to ChatGateway for Notifications:

• Added a userSocketMap to track connected sockets for each user and manage their notification rooms. (src/chat/chat.gateway.ts, src/chat/chat.gateway.tsR39-R47)
• Implemented logic to join users to notification rooms upon connection and fetch/send their unread notifications in real time. (src/chat/chat.gateway.ts, src/chat/chat.gateway.tsR65-R93)
• Added methods to send notifications to specific users, check if a user is online, and handle subscription to notifications. (src/chat/chat.gateway.ts, src/chat/chat.gateway.tsR103-R142)

Integration of Notifications Module:

• Imported the NotificationsModule into the ChatModule to establish a dependency between the two modules. (src/chat/chat.module.ts, [1] [2]
• Added a forward reference to the ChatModule in the NotificationsModule to resolve circular dependencies. (src/notifications/notifications.module.ts, src/notifications/notifications.module.tsL1-R16)

Updates to NotificationService:

• Injected the ChatGateway into the NotificationService to enable real-time notification delivery. (src/notifications/notifications.service.ts, src/notifications/notifications.service.tsR14-R15)
• Enhanced the notification creation process to send notifications in real time if the recipient is online, or log that the notification will be delivered later. (src/notifications/notifications.service.ts, src/notifications/notifications.service.tsR58-R74)