Show new unread async questions on course page

[AdamFipke]

Description

Essentially something like this:

Could also use green maybe, just try to keep it visually distinct from the queues but not too visually distinct that that is the only thing they focus on

I am unsure on the best way to implement this, but one idea I had was to add a new unreadAsyncQuestions column inside user_course_model (i.e. the entity that represents the many-to-many relationship between user and course). Then, it would be as simple as adding 1 to all unreadAsyncQuestions whenever a new async question is created.