`role`: Subscribe or unsubscribe from a role.

    **Usage:** `role subcommand [name]`

    `role join ROLE`: Subscribe to role ROLE.
    `role leave ROLE`: Unsubscribe from role ROLE.
    `role add ROLE`: Register ROLE as a joinable/leavable role. User must have
    Manage Roles permission.
    `role remove ROLE`: Unregister ROLE as a joinable/leavable role. User must
    have Manage Roles permission.
    `role list`: List the registered roles for the server.