Ability to mark messages as unread

This feature is now live. You can mark messages as unread in both one-on-one and group conversations.

Documentation:

• React: https://www.cometchat.com/docs/ui-kit/react/core-features#mark-as-unread

• iOS: https://www.cometchat.com/docs/ui-kit/ios/core-features#mark-as-unread

• Android: https://www.cometchat.com/docs/ui-kit/android/core-features#mark-as-unread

• Flutter: https://www.cometchat.com/docs/ui-kit/flutter/core-features#mark-as-unread

Thanks for the feedback and for helping us improve CometChat.