Configurable voting-degree in council elections pallet (#13305)

* configurable council elections pallet

* configurable council elections pallet

* add warning

* reduce sizes

* ".git/.scripts/commands/bench/bench.sh" pallet dev pallet_elections_phragmen

* fix stuff

* make assert

* fix docs

* fix docs again

* fix docs again

* Update frame/elections-phragmen/src/lib.rs

Co-authored-by: Gonçalo Pestana <g6pestana@gmail.com>

* Update frame/elections-phragmen/src/lib.rs

Co-authored-by: Gonçalo Pestana <g6pestana@gmail.com>

* Update frame/elections-phragmen/src/lib.rs

Co-authored-by: Gonçalo Pestana <g6pestana@gmail.com>

* fix docs

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Co-authored-by: command-bot <>
Co-authored-by: Gonçalo Pestana <g6pestana@gmail.com>