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/import.rb

@@ -3,6 +3,7 @@
 #
 # Table name: imports
 #
+#  id                :integer          not null, primary key
 #  type              :integer          not null
 #  approved          :boolean          default(FALSE), not null
 #  created_at        :datetime         not null
@@ -11,8 +12,7 @@
 #  data_content_type :string
 #  data_file_size    :integer
 #  data_updated_at   :datetime
-#  account_id        :bigint           not null
-#  id                :bigint           not null, primary key
+#  account_id        :integer          not null
 #
 
 class Import < ApplicationRecord