feat: add RCV Copeland voting system

[bonustrack]

Add new voting system, ranked choice voting with Copeland's method. This was suggested by ENS DAO.

[ChaituVR]

Is there some notes or docs that suggests how copeland works (except Wikipedia)?

[ChaituVR]

If votes are

[
  { choice: [ 1, 2, 3, 4 ], balance: 0.5, scores: [ 0.5 ] },
  { choice: [ 2, 1, 3, 4 ], balance: 2.3, scores: [ 2.3 ] },
  { choice: [ 1, 3, 2, 4 ], balance: 0.7, scores: [ 0.7 ] },
  { choice: [ 2, 1 ], balance: 1.1, scores: [ 1.1 ] },
  { choice: [ 1, 2, 3, 4 ], balance: 1, scores: [ 1 ] },
  { choice: [ 2, 1, 3, 4 ], balance: 1, scores: [ 1 ] },
  { choice: [ 1, 3, 2, 4 ], balance: 1, scores: [ 1 ] },
  { choice: [ 2, 1 ], balance: 1, scores: [ 1 ] }
]

Scores are expected to be [2, 3, 1, 0] according to Copeland but i get [ 4, 6, 2, 0 ] using this

[ChaituVR]

Also Copeland scores are not equal to voting power 🤔 how do we handle quorum in this case
I think we may need to change many things for this

I mean results are not really based on voting power, instead it is calculated based on wins/losses with other choice