Benchmark pallet sudo

[ggwpez]

The sudo pallet does not use correct weight annotations in set_key (and probaly other calls as well):

substrate/frame/sudo/src/lib.rs

Lines 198 to 199 in 1bbde5d

	#[pallet::weight(0)]
	pub fn set_key(

Considering that people use Substrate as reference on how to write good pallets, we should probably do a minimal bench to fix it.

[Doordashcon]

don't think we need it in sudo extrinsic, sudo_as could be improved on