forum: add /forum_topic_visits.{json,xml} endpoint.

For debugging purposes only.

app/controllers/forum_topic_visits_controller.rb

@@ -0,0 +1,9 @@
+class ForumTopicVisitsController < ApplicationController
+  respond_to :xml, :json
+  before_action :member_only
+
+  def index
+    @forum_topic_visits = ForumTopicVisit.where(user: CurrentUser.user).paginated_search(params)
+    respond_with(@forum_topic_visits)
+  end
+end