Ranked Collective pallet (#11548)

* Ranked Collective pallet

* Fixes

* benchmarks

* Weights

* Allow class voting in rank
Use bare ayes for calculating support.
Allow only promotion/demotion by one rank only.
Allow removal of member with rank zero only.
Use new Tally API

* Index by rank, still O(1).

* Custom vote weights

* Formatting

* Update frame/ranked-collective/src/lib.rs

* Broken :(

* origin guard; cleanup uses new API

* Formatting

* Promote/demote by rank

* Formatting

* Use new API

* Remove code in another PR

* Remove code in another PR

* Formatting

* Remove code in another PR

* Docs

* Docs

* Bump

* Fixes

* Formatting

* Fixes

substrate/frame/support/src/dispatch.rs

@@ -2748,6 +2748,9 @@ mod tests {
 		fn signed(_by: <TraitImpl as system::Config>::AccountId) -> Self {
 			unimplemented!("Not required in tests!")
 		}
+		fn as_signed(self) -> Option<Self::AccountId> {
+			unimplemented!("Not required in tests!")
+		}
 	}
 
 	impl system::Config for TraitImpl {