MEL: Origin, Referenda, ConvictionVoting (#11631)

* Referenda & CV pallets ready

* Fix build

* Add mel_bound for Voting and Casting types

* Add mel_bound on Tally

* Add mel_bound on another Tally

* Add mel_bound for pallet_collective::RawOrigin

Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>

substrate/frame/collective/src/lib.rs

@@ -48,7 +48,7 @@ use sp_runtime::{traits::Hash, RuntimeDebug};
 use sp_std::{marker::PhantomData, prelude::*, result};
 
 use frame_support::{
-	codec::{Decode, Encode},
+	codec::{Decode, Encode, MaxEncodedLen},
 	dispatch::{DispatchError, DispatchResultWithPostInfo, Dispatchable, PostDispatchInfo},
 	ensure,
 	traits::{
@@ -124,8 +124,9 @@ impl DefaultVote for MoreThanMajorityThenPrimeDefaultVote {
 }
 
 /// Origin for the collective module.
-#[derive(PartialEq, Eq, Clone, RuntimeDebug, Encode, Decode, TypeInfo)]
+#[derive(PartialEq, Eq, Clone, RuntimeDebug, Encode, Decode, TypeInfo, MaxEncodedLen)]
 #[scale_info(skip_type_params(I))]
+#[codec(mel_bound(AccountId: MaxEncodedLen))]
 pub enum RawOrigin<AccountId, I> {
 	/// It has been condoned by a given number of members of the collective from a given total.
 	Members(MemberCount, MemberCount),