Bug 31116: Add circulation sidebar to article requests

Bug 31116: Add circulation sidebar to article requests

This patch adds the circulation sidebar menu to the article requests
page to make it consistent with other circulation module pages.

Test plan
1) Prior to applying the patch confirm that there is no sidebar on the
   article requests management page, regardless of the CircSidebar
   perference.
2) Apply the patch
3) Confirm there is still no sidebar when CircSidebar is disabled
4) Confirm there is now a sidebar present when CircSidebar is enabled
5) Confirm the current page is highlighted correctly in the sidebar when
   on the article requests page.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>