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/policies/poll_policy.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class PollPolicy < ApplicationPolicy
+  def vote?
+    !current_account.blocking?(record.account) && !record.account.blocking?(current_account)
+  end
+end