Add API types for status and related objects (#29792)

app/serializers/rest/media_attachment_serializer.rb

@@ -3,6 +3,8 @@
 class REST::MediaAttachmentSerializer < ActiveModel::Serializer
   include RoutingHelper
 
+  # Please update `app/javascript/mastodon/api_types/media_attachments.ts` when making changes to the attributes
+
   attributes :id, :type, :url, :preview_url,
              :remote_url, :preview_remote_url, :text_url, :meta,
              :description, :blurhash

app/serializers/rest/poll_serializer.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class REST::PollSerializer < ActiveModel::Serializer
+  # Please update `app/javascript/mastodon/api_types/polls.ts` when making changes to the attributes
+
   attributes :id, :expires_at, :expired,
              :multiple, :votes_count, :voters_count
 

app/serializers/rest/status_serializer.rb

@@ -3,6 +3,8 @@
 class REST::StatusSerializer < ActiveModel::Serializer
   include FormattingHelper
 
+  # Please update `app/javascript/mastodon/api_types/statuses.ts` when making changes to the attributes
+
   attributes :id, :created_at, :in_reply_to_id, :in_reply_to_account_id,
              :sensitive, :spoiler_text, :visibility, :language,
              :uri, :url, :replies_count, :reblogs_count,