add menu tool links to gear menus on modules index

test plan:
* create an external tool with one or more of the
following extension types configured:
'assignment_menu', 'module_menu', 'quiz_menu',
'wiki_page_menu'

* enable lor feature flag for account or user
* for a course, the gear menu for modules and exportable
 module items (assignments, quizzes, and wiki pages for now),
 should contain a new link (if configured)

* clicking the link should launch the tool, passing a query
 parameter (either 'modules%5B%5D=:id' for modules, or
 'module_items%5B%5D=:id' for items)
 (note: '%5B%5D' is equivalent to '[]' escaped)

closes #CNVS-14547 #CNVS-14552 #CNVS-14553 #CNVS-14554

Change-Id: Ifebf669c25f600c6491648ad8ec5ab65c62932ba
Reviewed-on: https://gerrit.instructure.com/39874
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Bracken Mosbacker <bracken@instructure.com>