[Feature] Part 1: add TargetList for validator ranking (#12034)

* [Feature] Part 1: add TargetList for validator ranking

* remove redundant todo

* remove typo

* cleanup

* implement score

* more fixes

* fix thresholds

* fmt

* Remove the stuff that has to come in the next PR, some fixes

* extended balance import

* Change all the references from VoteWeight to Self::Score

* Add a migration for VoterBagsList

* fix score

* add targetList to nomination-pools tests

* fix bench

* address review comments

* change get_npos_targets

* address more comments

* remove thresholds for the time being

* fix instance reference

* VoterBagsListInstance

* reus

* remove params that are not used yet

* Introduced pre/post upgrade try-runtime checks

* fix

* fixes

* fix migration

* fix migration

* fix post_upgrade

* change

* Fix

* eloquent PhantomData

* fix PD

* more fixes

* Update frame/staking/src/pallet/impls.rs

Co-authored-by: Squirrel <gilescope@gmail.com>

* is_nominator now works

* fix test-staking

* build fixes

* fix remote-tests

* Apply suggestions from code review

Co-authored-by: parity-processbot <>
Co-authored-by: kianenigma <kian@parity.io>
Co-authored-by: Squirrel <gilescope@gmail.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>