[WIP] Add corresponding role for registration_commands module

[wbclark]

Initial work by @stejkalleos

This was dropped from #1283 , therefore creating a separate PR so that the basic work is not lost.

Requires #1283

[evgeni]

We now have a registration_command module via #1683, but I fail to see which benefit this role gives over calling the module directly?

@wbclark is this still a thing you'd think is needed?