Adds a `rad delegate` CLI command.
The command consists of three subcommands:
* `add` -- add a new delegate to the set of delegates of a project
* `remove` -- remove an existing delegate from the set of delegates of a
project
* `list` -- list the delegates of a project
Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett
Fintan Halpenny