Add Message Notifications

[Prithwi32]

Implement toast notifications for important updates such as new messages, mentions, or room invitations. Ensure that notifications are visually distinct and do not disrupt the user experience.

[Archi-shaw]

@Prithwi32 Assign this issue to me.

[Prithwi32]

@Archi-shaw Sure, all the best

[Prithwi32]

@Archi-shaw Sure, all the best

You complete both frontend and backend, and the assigned level is hard.

[Prithwi32]

@Archi-shaw any updates?

[Archi-shaw]

@Prithwi32 Will complete it by 9. My exams are going on it bot hectic to manage. Sorry for inconvenience caused.