CLI needs a "delete" command for issues

[pablos08]

Autopilot works by creating an issue for every run. For hourly monitoring tasks, this gets to be a lot of clutter pretty quickly. I tried to make cleanup tasks to delete the finished runs, but Multica protests. The multica CLI has no issue delete command. The only issue subcommands are assign / comment / create / get / label / list / rerun / search / status / subscriber / update. So Multica can't actually remove these issues from the CLI — it can only change their status.

[darktempla]

Might be good to make it option what to do. Personally I would prefer they were archived for historical audit reasons. For others hard deleting might be optimal.