feat(protocol-contracts): improve fees management in staking contracts

[melanciani]

refs https://github.com/zama-ai/fhevm-internal/issues/716

[mergify]

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[arr00]

Who will be the owner? Is this going to be a trusted party or governance system? In that case, should we consider upgradeability here?

Upgradeability was initially ruled out as allowing the operator themselves to control that would be far too permissive.

[melanciani]

Who will be the owner? Is this going to be a trusted party or governance system? In that case, should we consider upgradeability here?

Upgradeability was initially ruled out as allowing the operator themselves to control that would be far too permissive.

the owner will be a governance DAO system, so yes it does make sense to consider upgradability in the end ! I will add it in a follow-up PR

btw note that in #1540 we make the owner of ProtocolStaking the owner of OperatorStaking and OperatorRewarder ! thanks for the suggestion