Accessibility - Add Conversation menu items to individual message cog menus

added Reply Button, and a cog containing Reply All, Forward, Star, Archive, Delete
to the top of the message details

Fixes CNVS-14513

Test Plan:

- Got to an inbox with a message
- Click the message
- There should be a reply and cog at the top of the thread
- The cog should contain Reply All, Forward, Star, Archive, Delete
	- All items should function correctly

Change-Id: I47d4844c794d2033ffda036c43e2486ea4675f4e
Reviewed-on: https://gerrit.instructure.com/41288
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Aaron Cannon <acannon@instructure.com>
QA-Review: Steven Shepherd <sshepherd@instructure.com>
Reviewed-by: Jason Madsen <jmadsen@instructure.com>
Reviewed-by: Joel Hough <joel@instructure.com>