[NEW] In-app notification (#964)

* added Notification badge

* added notification to state

* added condition not see notification of current room

* fixed lint

* fixed some bugs

* fixed some bugs

* removed navigation prop

* fixed navigation bug

* removed unessary changes

* done requested chamges

* made separate notification for ios and android

* merged notification

* Removed unnecessary sub

* Animation

* Layout changes

* Refactor