Initial poll refresh support

Implement refreshing the object with an interval and call the function
when getting the poll.

lib/pleroma/web/mastodon_api/controllers/mastodon_api_controller.ex

@@ -485,7 +485,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def get_poll(%{assigns: %{user: user}} = conn, %{"id" => id}) do
-    with %Object{} = object <- Object.get_by_id(id),
+    with %Object{} = object <- Object.get_by_id_and_maybe_refetch(id, interval: 60),
          %Activity{} = activity <- Activity.get_create_by_object_ap_id(object.data["id"]),
          true <- Visibility.visible_for_user?(activity, user) do
       conn