Add comments to stories

[arielj]

https://ombulabs.atlassian.net/browse/DT-254

Branch/Commit:

Main Branch

Describe the feature:

People working on a project would be able to add comments to each story. Comments will work as communication between the people working there but won't show up in the action plan.

Problem:

Discussion about stories in a project happens outside points (slack for example). This creates a problem where the story and the discussion are in 2 different places and it's hard to have visibility on both things.

Mockups:

When showing a story we should show a list of comments witht username and timestamp. We should show a form to create comments too.

Maybe an edit option would be useful.

We can try Rails' ActionText feature to support WYSIWYG.

Resources:

https://edgeguides.rubyonrails.org/action_text_overview.html

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