substrate Bound Election and Staking by MaxActiveValidators

This PR will bound pallet-stakingwith MaxActiveValidators. It is part of an ongoing effort towards bounding all pallet-staking storage items. https://github.com/paritytech/substrate/issues/12187.

Add BoundedSupports.
Introduce MaxWinners to ElectionProvider that bounds the maximum winners that can be elected for an election.
Ensure pallet-staking (ElectionDataProvider) never asks for desired_targets higher than MaxWinners. This ensures offchain miner does not need any changes to stay compatible with the new code.

Polkadot companion: https://github.com/paritytech/polkadot/pull/6157

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