Create a Discord guild role

Creates a new role in the guild.

Requires the bot to hold the Manage Roles permission. Guilds that added the Zernio bot before role management shipped must re-invite it, because Discord applies the permission set at invite time.

Discord's role hierarchy applies: the bot cannot create a role positioned at or above its own highest role, and cannot grant permissions it does not itself hold. Either attempt returns a 403 carrying Discord's own error.