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/controllers/api/v1/polls_controller.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class Api::V1::PollsController < Api::BaseController
+  before_action -> { authorize_if_got_token! :read, :'read:statuses' }, only: :show
+
+  respond_to :json
+
+  def show
+    @poll = Poll.attached.find(params[:id])
+    ActivityPub::FetchRemotePollService.new.call(@poll, current_account) if user_signed_in? && @poll.possibly_stale?
+    render json: @poll, serializer: REST::PollSerializer, include_results: true
+  end
+end