Enable inline creation for Comments/Updates on task level

[#1]

The idea is to allow adding updates/comments to tasks through the inline edit functionality. 

We use a backlog project to manage multiple backlog tasks and need to add grooming notes to each of the tasks every week. We do this using the inline edit function on a task view. While we have been using a custom text field which enables us to edit line, it would be great if we could add a new update/comment using inline edit.

Ideally, we would be able to add updates/comments when we are inline edit mode. When saved the newly added update/comment would land in the updates section of the task. When not in edit mode the column should show the last update. 

Currently, there is no way to edit/add comments using inline edit on a task view.