Users can access the messaging panel to discuss any plans
Design: https://www.figma.com/file/gdwMnbpudJxuzVrORrOGvd/Ed-Member-Site-UX?node-id=16040%3A180285
General Concept
UI
For any plan that is being viewed or is in the create/edit state, the discussion panel will show
The user will see new messages in their inbox
Clicking on the message will take the user to view plan screen so they may respond to the message
Business Rules
The user may add any team member with permission to View Plans who also currently has access to this student and classroom