Implement Push Notifications for New Messages

[Charan0313]

Issue Title:

Implement Push Notifications for New Messages

Description:

Enhance the user experience by implementing push notifications to alert users when they receive new messages in the chat app. This issue focuses on integrating push notification functionality to keep users informed and engaged, even when the app is not actively in use.

Tasks:

• Integrate Firebase Cloud Messaging (FCM) or an alternative push notification service into the chat app project.
• Implement a message listener function to detect new messages sent to the user and trigger push notifications accordingly.
• Configure notification payloads to include relevant information, such as sender name, message content, and timestamp, to provide context for the received message.
• Customize notification appearance and behavior based on user preferences and platform guidelines, ensuring a consistent and intuitive notification experience across devices.
• Test push notification functionality on both Android and iOS devices to verify proper delivery and behavior under various network conditions.
• Handle edge cases, such as app foreground and background states, to ensure reliable notification delivery and user engagement.
• Document the push notification implementation details, including setup steps and code modifications, for future reference and maintenance.