Make it obvious which thread contains unread messages

[CalHoll]

Please select which package this feature is related to

stream_chat_flutter

Which platforms would this feature impact?

iOS, Android, Web, Windows, MacOS, Linux

Is your feature request related to a problem?

Users are frustrated when they have an unread message but can't find it because it's in a thread.

Describe the solution that you'd like

When a thread contains unread messages an icon and bolded/colored text or some other identifier should be used to easily find which thread contains the unread message.

Describe alternatives that you have considered

No response

Additional context

No response

Code of Conduct

• [X] I agree to follow this project's Code of Conduct