fix(protocol-contracts): add indexed parameters to staking events (N-05) (#1687)

Author: melanciani

protocol-contracts/staking/contracts/OperatorRewarder.sol

@@ -40,7 +40,7 @@ contract OperatorRewarder {
      * @param oldBeneficiary The previous beneficiary address.
      * @param newBeneficiary The new beneficiary address.
      */
-    event BeneficiaryTransferred(address oldBeneficiary, address newBeneficiary);
+    event BeneficiaryTransferred(address indexed oldBeneficiary, address indexed newBeneficiary);
 
     /// @notice Emitted when the contract is shut down.
     event Shutdown();
@@ -64,7 +64,7 @@ contract OperatorRewarder {
      * @param receiver The address that will receive the rewards.
      * @param claimer The address authorized to claim rewards on behalf of the receiver.
      */
-    event ClaimerAuthorized(address receiver, address claimer);
+    event ClaimerAuthorized(address indexed receiver, address indexed claimer);
 
     /// @notice Error for invalid claimer address.
     error InvalidClaimer(address claimer);

protocol-contracts/staking/contracts/OperatorStaking.sol

@@ -76,7 +76,7 @@ contract OperatorStaking is ERC1363Upgradeable, ReentrancyGuardTransient, UUPSUp
      * @param oldRewarder The previous rewarder contract address.
      * @param newRewarder The new rewarder contract address.
      */
-    event RewarderSet(address oldRewarder, address newRewarder);
+    event RewarderSet(address indexed oldRewarder, address indexed newRewarder);
 
     /// @dev Thrown when the caller is not the ProtocolStaking's owner.
     error CallerNotProtocolStakingOwner(address caller);