Lists (#5703)

* Add structure for lists

* Add list timeline streaming API

* Add list APIs, bind list-account relation to follow relation

* Add API for adding/removing accounts from lists

* Add pagination to lists API

* Add pagination to list accounts API

* Adjust scopes for new APIs

- Creating and modifying lists merely requires "write" scope
- Fetching information about lists merely requires "read" scope

* Add test for wrong user context on list timeline

* Clean up tests

app/models/report.rb

@@ -3,15 +3,15 @@
 #
 # Table name: reports
 #
+#  id                         :integer          not null, primary key
 #  status_ids                 :integer          default([]), not null, is an Array
 #  comment                    :text             default(""), not null
 #  action_taken               :boolean          default(FALSE), not null
 #  created_at                 :datetime         not null
 #  updated_at                 :datetime         not null
-#  account_id                 :bigint           not null
-#  action_taken_by_account_id :bigint
-#  id                         :bigint           not null, primary key
-#  target_account_id          :bigint           not null
+#  account_id                 :integer          not null
+#  action_taken_by_account_id :integer
+#  target_account_id          :integer          not null
 #
 
 class Report < ApplicationRecord