rusty-gd: Add controller facade service.

The ControllerTest pass with this change.

ControllerExports is currently not being updated as a result of
set_local_name. That will be handled as a follow up.

Bug: 171749953
Tag: #gd-refactor
Test: gd/cert/run --rhost ControllerTest

Change-Id: I1ceca00bac74451e915518288108ba149750dc6f