FEATURE: add first post likes data serializer (#31216)

This PR adds two attributes (`op_can_like` & `op_liked`) to
`TopicListItemSerializer`.

We've also added `serialize_topic_op_likes_data` theme modifier so that
these two attributes are only added when a theme or component needs this
data.

db/migrate/20250205174221_add_serialize_topic_op_likes_data_theme_modifier.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+class AddSerializeTopicOpLikesDataThemeModifier < ActiveRecord::Migration[7.2]
+  def change
+    add_column :theme_modifier_sets, :serialize_topic_op_likes_data, :boolean, null: true
+  end
+end