Add polls (#10111)

* Add polls

Fix #1629

* Add tests

* Fixes

* Change API for creating polls

* Use name instead of content for votes

* Remove poll validation for remote polls

* Add polls to public pages

* When updating the poll, update options just in case they were changed

* Fix public pages showing both poll and other media

app/serializers/rest/status_serializer.rb

@@ -21,6 +21,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
   has_many :emojis, serializer: REST::CustomEmojiSerializer
 
   has_one :preview_card, key: :card, serializer: REST::PreviewCardSerializer
+  has_one :poll, serializer: REST::PollSerializer
 
   def id
     object.id.to_s