Add user notes on accounts (#14148)

* Add UserNote model

* Add UI for user notes

* Put comment in relationships entity

* Add API to create user notes

* Copy user notes to new account when receiving a Move activity

* Address some of the review remarks

* Replace modal by inline edition

* Please CodeClimate

* Button design changes

* Change design again

* Cancel note edition when pressing Escape

* Fixes

* Tweak design again

* Move “Add note” item, and allow users to add notes to themselves

* Rename UserNote into AccountNote, rename “comment” Relationship attribute to “note”

app/serializers/rest/relationship_serializer.rb

@@ -3,7 +3,7 @@
 class REST::RelationshipSerializer < ActiveModel::Serializer
   attributes :id, :following, :showing_reblogs, :followed_by, :blocking, :blocked_by,
              :muting, :muting_notifications, :requested, :domain_blocking,
-             :endorsed
+             :endorsed, :note
 
   def id
     object.id.to_s
@@ -50,4 +50,8 @@ class REST::RelationshipSerializer < ActiveModel::Serializer
   def endorsed
     instance_options[:relationships].endorsed[object.id] || false
   end
+
+  def note
+    (instance_options[:relationships].account_note[object.id] || {})[:comment]
+  end
 end