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/Cargo.toml

@@ -115,6 +115,7 @@ members = [
 	"frame/nomination-pools",
 	"frame/nomination-pools/benchmarking",
 	"frame/randomness-collective-flip",
+	"frame/ranked-collective",
 	"frame/recovery",
 	"frame/referenda",
 	"frame/remark",